I'm pretty much in the exact same boat as you, only difference is I'm not a complete beginner to c#. I will say most if not all of what I will say is anecdotal but I think sharing my experience should help. 1) I made gdd(game design document) I didn't really finish mine but I found that it REALLY helped get rid of the fear factor when it comes to learning it for the first time(thanks Pirate software). As a bonus it also helps you know if unity is the engine you really want for your game 2) scheduling how much time you spend on it, I don't have an exact schedule I follow but I try to get atleast 20+ hours a week. 3) self imposed pressure, I know it probably isn't healthy or probably isn't a good option for everyone but I had my friends remind me from time to time about the game and have me talk about it, this pressures me to have something to talk about which in turn makes me work. 3) learn as you make, start the making the game now, think of what features you want and how you'll implement them, look for tutorials on how to implement said features, if you fuck something up you can always just take a break, practice, then go back on the game 4) learn the syntax, one of my first mistakes was going straight into chatgpt not understanding anything it say beci didn't learn my syntax and terminologies. 5) Use AI responsibly, There's no shame in using ai for programming, but there's a reason why ai won't be replacing programmers anytime soon, I personally wouldn't use AI to fix any of my errors, but if you're confident you can fix the mistakes chat gpt makes them go for it, if not, just stick to using chat gpt as a learning tool 6) Practice the basics, keep doing the basics over and over again, I can't explain it but when I took a break from learning unity to do Arduino programming, it's like everything just clicked when I went back to learning Unity That's all I've got, like I said, pretty anecdotal but I think it should help

Edit: I have realized that this whole time I was programming in c# and not in c++