Question T-RPG Starting Guide as first game

I've always been interested in making games and I've been really interested in making a TRPG in the vein of Fire Emblem and FF Tactics. I got started recently with trying to make a hex-based 3D TRPG and I've gotten to the point where I can create a basic tilemap and movement. I've been following a number of guides to help me get this far, but I've come to the realization that I feel like I'm not getting more proficient at using Unity (other then some very basics)

I have programming experience - (I work as a software developer) so the coding is actually the least of my problems, but I feel like I constantly start on new projects then restart (and downsize) when I get to a point where things that work out properly. At this point I've realized that my initial project is still too big despite scaling it back considerably as a solo indie dev working on the side. I was hoping to put the project on hold and make a micro game first, but I wasn't sure what would be the best option in this case. Should I try making a small 2D project despite wanting to work with 3D? Or is there a type of 3D game you guys recommend that I should try and get started with?

 

First of all, focus on creating the game engine (programming is your advantage). You can do it on primitive shapes (no difference if 2D or 3D). If a TRPG player focuses primarily on combat (core gameplay) then the smallest working project should contain only that. Graphics, music, story, worry about later.

I've seen a lot of advice to start with small projects that can be closed. Not because anyone is supposed to make money on it, but to gain useful experience and solutions. However, if a person does not challenge himself and does not leave the comfort zone (of what he knows), he does not learn anyway.

You have to set yourself a realistic time frame. Can I finish the smallest working project in a time that satisfies me? How long can I motivate myself to finish something? I work as a programmer myself and I like to program after hours for myself, but I also want to treat it as a hobby, not a second job that exhausts me.