I will give it a shot today.
This is a cool idea! I contribute little by little when I can but this app looks like it makes it more convenient to do so.
Why does F-Droid tell me that the app has features that I may not like?
Non-Free Network Services
This Anti-Feature is applied to apps that promote or depend entirely on a Non-Free network service, or any service which is impossible, or not easy to replace. Replacement requires changes to the app or service. This antifeature would not apply, if there is a simple configuration option that allows pointing the app to a running instance of an alternative, publicly available, self-hostable, free software server solution.
Because you can't change it from using OpenStreetMap.org to an alternative self hosted site.
I do it but in Paris there are way too many things to add, so it feels too much most of the time
When it feels too much, I go back to the building where I live, and set small but realistic goals. Like, I want this block to be complete with all the questions. Then I look around and add things that aren't in the map yet, until my block is as close to complete as I can get it. An island of perfect mapping surrounded by more incomplete mapping. Only then I move on to another well defined area, preferably close to home. Maybe other people will see this example of good mapping and think "I could do that with my local area too!" My personal opinion is that OSM needs many local experts, rather than a few overwhelmed people trying to do it all for everyone else. I have my eyes on where I live, and notice changes over time.
OpenStreetMap community
Everything #OpenStreetMap related is welcome: software releases, showing of your work, questions about how to tag something, as long as it has to do with OpenStreetMap or OpenStreetMap-related software.
OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
Join OpenStreetMap and start mapping: https://www.openstreetmap.org.
There are many communication channels about OSM, many organized around a certain country or region. Discover them on https://openstreetmap.community
https://mapcomplete.org is an easy-to-use website to view, edit and add points (such as shops, restaurants and others)
https://learnosm.org/en/ has a lot of information for beginners too.