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Too many voices and not enough modulation - at least for a setup this size. I would consider taking a look at more envelopes or even a nice function generator, as well as another VCA/attenuator to specifically facilitate modulations of modulation. A module like the Zadar really shines with a VCA or attenuverter alongside it to have more hands-on control of the voltage amounts.
You have a few particularly huge modules in here, and while I think that's actually a good idea ergonomically, it hasn't left you with much room for more modulation with all the voices in there as well. Nevertheless, things like sample and hold or other simple modulation sources will do you a lot of good (and you can get a small sample and hold without much trouble, since they don't really need controls right on the module).
How many voices do you see yourself patching together at one time (drums included)? If it's only 3 or 4, you should be a bit better off, but might still need a couple amenities like what I mentioned above. If you want to run them all at once and really work them, you probably want a fair bit more modulation.
Do you have the standalone case thing for the Ground Control? That extra space could be great for modulation, and it probably makes the sequencer/keyboard more accessible. I understand if you're keen on having it in the rack, but if not, that's valuable real estate.
In terms of voices and sound sources, you definitely want the stuff that speaks to you, but with modulation, it's honestly the stuff that sounds boring, overly technical, or obvious in modular that ends up being the most fun and unique. I would take a look at some Serge and Buchla modules if I were you - not so much to buy them, but just to see how the basic plumbing of modular can help your techno stand out from more rigid and standardized DAW creations (I would also watch some tutorials on Maths, which is not only a great module but a great teaching tool for showing how flexible basic circuits can be). They really illustrate how dense the simple stuff can get and demonstrate how to use one or two voices to make a full and compelling arrangement. Modular techno doesn't have to be minimalist, but it's a lot more fun if it's efficient and all the parts are being pushed.
I can give you specific suggestions, though I hope you'll also keep looking at other stuff to make it your own.
Sample and Hold: Divkid RND STEP is a good one that offers a lot of function in a small amount of space. You can easily just get the 2hp one as well - this doesn't need to be a complicated circuit to be cool - but then you always need outside modulation.
Envelope/Function Generator: Most of my favorite modules like this are big (Buchla 281t, Maths, Doepfer A-143-1 and 143-2). If you can spare the space, modules like this can make your system really come alive. However, Vostok (the Atlas company) makes an envelope generator that is smaller but gives you tons of loopable envelopes for modulation.
VCA/Attenuators: This is a category where you should do your own research and find out what works best. However, the various clones of Mutable Veils, such as After Later Audio's Cloaks, are popular and have lots of options. I have a Frap Tools 321, an attenuverter, which is very different but works great for me. Learning the differences between these two will help you better understand what works best, but they're both well-liked and popular, and that reliability is a good sign you can use them to learn about this stuff.
Multiple: Definitely get a mult or two. If you want to multiply audio or pitch CV, get a buffered mult (whichever's most popular). If you don't want to do that - and with this many oscillators, I don't know if you would - I'd just say look at 0hp options like the Qu-bit Splitter or the Intellijel Hub. Cheap and easy.
You have a lot of effects in this rack. It is nice to have effects that talk to your modular stuff, but it does take up space for stuff that can be done outside the rack pretty easily. I do think the Versio modules are interesting because of all the different firmwares, though, and keeping one (or both if you're set on them) might be a good way to explore a lot of stuff in one module.
Honestly, you may also want to think about something like a 1010 Music Bluebox standalone (or another mixer that can handle eurorack levels as well). You're going to have a hard time getting a module in that rack to handle 7 audio sources gracefully and ergonomically (especially for techno, where you'll be happier if you can mute stuff and do effects sends). Plus it frees up your Doepfer Quad VCA for more experimental purposes. I don't really understand the way you have it currently with separate mixers for drums and oscillators and then a single stereo out. If you have a reason for it being that way, then that's different, of course, but I think mixing is just one of those things that's hard to do in the rack without a whole new row for this stuff.
I don't know how you like to play this stuff, so you may choose modules that have different sizes or interfaces to these ones to highlight what you like more. Even that big Vermona module could be very useful if you thought you'd get a lot out of having big luxurious knobs and lots of space/options for your LFOs - it just depends on where you want your hands to spend the most time and what parts of your music you want to have control over in the moment. These suggestions are just me trying to add simple functions to what you already have and not change your original vision too much.