it really depends what you are trying to aim for long term - this just adds a oscillator and a few basic effects
personally I would start by expanding the modulation capabilities some more
maths (see the 'maths illustrated supplement'), links, kinks, shades and veils (or modules that add the same functionality)
and then look at maybe adding another voice (sound source, sound modifier, modulation source) and ways to combine them more - a matrix mixer for modulation and an end of chain mixer (unless you have an external one already)
if you want to get the most variety out of your patches try to think in this ratio:
sound sources < sound modifiers < modulation sources < utilities
I would also suggest reading a load of other - 'how to expand my (insert name of semi-modular)' threads - they are all relevant
"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