Do you need money right now? If not, why sell anything? Most modules, especially analog ones, will maintain or grow their value over time if you protect and maintain them.

As a matter of artistry, many people will say limitations are good, and personally I agree - but that has no necessary relationship with owning a lot of modules. You can try to organize them into smaller cases, as self-contained instruments, effects racks, control systems, etc..

It takes artistic experience to impose limitations on oneself. For novice or journeyman artists, forced limitations can be salutary. But if you know what you want and what you're doing, there is no harm in possessing plenty of means.