Okay, so I'm gonna say up front, this is a hard problem. I have not marketed a successful game! I'm making snap shallow judgments here, and while they could be a useful insight into the reddit/youtube audience you're trying to reach, I don't claim to actually have the answers.

That said: what you've got is not very far along and clearly isn't a fun game yet. Nothing is really happening except some jumping and daintily taking out a pickaxe. The art and animations are very amateur. (There's a stronger correlation between good animation and good gameplay than people are consciously aware of--a good dash or jump or attack feels good.) The story premise is interesting, but only if you can write dialog well and actually tell a good story. Just describing it isn't enough.

Making a game by yourself is hard! It sucks to have to be good at everything. Being a solo dev gives you creative freedom, simplifies money concerns and means you don't have to navigate as many social interactions, but you won't get any marketing boost for being solo if the game can't stand on its own. There's over a million games on itch and more being made every day, and people want to play the best. They'll all have different preferences and different ideas of "best," but they aren't throwing darts at a board either. What is Beastbound doing so well in this video that people should give it a second glance?

Anyway, I don't think you should worry about marketing just yet. A lot of it is luck, but you have to get yourself into the right position first or luck won't matter.

(And just to be clear, I'm saying all of this through a marketing angle, because you asked. It's totally valid for that not to be your goal at all. There's nothing wrong with just making the game you want to make!)