lots of good advice already!!!
I think that if you are stuck on the number of sound sources in the case, either adding an extra row to the rack, or better yet doubling the size of it, to allow for more modulation sources, a lot more utility modules and a decent mixing solution - ideally imo a matrix mixer (particularly, but not limited to, for modulation sources), some sub-mixers (for both cv and audio) and an end of chain mixer
see the formula in my signature for a quick guide to improving versatility of your modular for the least cash outlay
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities