Hey! I love this idea and the fact you've launched a successful game before really gives me confidence in the project. I've been aching to be part of a cool team making an awesome 3D game for a while now, and this seems like a real neat opportunity.
My skills are in programming and general Unity tasks. I've been programming in C# for almost 4 years now. And I've done lots of polish work in Unity.
I've never worked on a project of this scope (or genre) before so I'm not especially qualified. The last time I did networking was in 2020, LAN on mobile, using Unity's old netcode. But I'm still a capable programmer (with over 3 years of Unity experience) and can learn whatever will make me useful. I can even just do tool programming! Every game needs tools!
And I also know how to use git (using a terminal too, though I usually don't). I've committed to the Godot repository once, and have another PR in purgatory. (I'm hoping this convinces you of my ability to understand code written by others and my ability to follow procedures.)
You'll see all the games I've released on my itch profile. Despite that they're mostly 2D I do know 3D vector math. I just never released any of my 3D prototypes, because they're always ugly and unpolished. As far as the time I have, I can certainly do 5 hours per week, probably more like 10 or more.
If you're still looking for help and think I'd be worth talking with, here's my discord name: @xenoparrot
(sorry I don't know how to DM or I would've)
~~ :D