There is a learning curve to building a synthesizer from scratch. The C4 is a pedal that lets you build a synthesizer from scratch. But you don't have to.
I started off by simply browsing presets with my mobile phone and putting them into the pedal with the 1/8" to 1/4" cable. Since there are thousands of user made presets, this kept me busy for a while.
The next step was understanding the Neuro software.
Instead of building my stuff from scratch, I started off by tweaking presets to my liking.
I think I had the C4 on my board for well over a year before I made my first synth all on my own, starting from scratch.
How something sounds in your bedroom vs. how it sounds in a mix is an old problem for bassists and it's not
limited to synthesizers. All I can offer in that regard is to find useful playalong tracks (there are many on YT)
and feed them into your mixer at home along with your bass signal.
That's part of the problem- I'm very comfortable with synthesis, and similarly I'm very comfortable with clunky software… but this is simply hard to use effectively. It's too flexible but not flexible enough, and I'd argue it really is just a clunky interface that needs a redesign