Hello hello!
I also decided to go for the full-game development last year, and this was really a year of learning!
I never had games rated as high as yours on GWJ, and my best game so far - Final Form, the only one that ended up in the top-10. So the first half of the year I spent trying to bring it to a full game...
But then I participated in another jam - GMTK - our game was very well received, and I persuaded the team to make that one into a full game. And largely because I recognized that we have some marketing/visibility potential that Final Form lacks.
So I've made a trailer, it went micro-viral, we got ~1000 wishlist in a week, and we are still working on bringing a bigger version of the game... This is the game btw: https://store.steampowered.com/app/3959020/Imagine_Sisyphus_Happy/
So, besides development, the second half of the year was all about learning to market and feature your game on Steam :) Happy to share some tips and experience based on what I learnt - I'm very far from pro, but I do think I mostly figured out the most basic steps. And figured out where to look for good advice :)