If you want to learn more then do LFS. I don’t think Gentoo teaches you much more than a manual Arch install. But very few daily drive LFS. It’s hardly practical. Gentoo is daily drivable but if you don’t care about compiling all your own packages then I don’t think it’s for you.
I’d say just do LFS on an old laptop or a VM.



Maybe block on your router and save your router password such that you need to jump through several hoops to unlock it, eg password saved in one password manager DB whose master password is in another DB whose password is in another DB, etc. If you have to unlock like 10 password databases to get into your router, you’ll probably give up on whatever bad habit you were trying to do as it’s too much effort.