A couple of good sites to check out are Itch and GameJolt. Both are designed for indie developers, but Itch is more like a storefront whereas GameJolt is more of a general developer forum with a distribution platform.
Some good places to spread the word are also mentioned in #welcome on the Official Godot Discord Server.
I've also had decent success by just showcasing my game in larger Discord communities and message boards I'm a part of (provided they're fine with you doing that, of course.) Never be afraid to tell anyone you can!