StreetComplete is perhaps the easiest and maybe best way to contribute as it is on rails. Constraining input for newer users is great. If your area is saturated with information I look at that as a win for the open community as a whole, but I understand the desire to add more.
There is SCEE which has advanced features and more editing options but I haven't explored it yet. I am just happy something like StreetComplete exists to allow me to contribute in a meaningful way without adding garbage data.
I use gocryptfs because it can be used on Android (DroidFs) and Linux desktop so I can sync my shares.
There's a few GUIs for desktop for it that you can try out and see if they help with your use case.