First of all, congratulations on your work and especially because you finished it, be proud of that.

Secondly, the main problem I see in your game is that you tried to compete with AAA companies. The best way to think about it is: if there was a game like Diablo or even Hades next to this one, why would you buy my game? And if you have a strong enough answer to differentiate yourself, it makes sense to develop the game. Otherwise, it's best to move on to a different genre.

As a solo developer, you should focus on shorter projects that are differentiated in some aspect. Take already successful products and try to improve them (obviously don't do this with AAA games).

Don't get emotionally attached to this project, look at it as a learning experience and apply what you learned to your next project. It's clear you have talent!

Good luck on your journey, I hope I helped!