On Android you can use StreetComplete. With it, you'll be mostly able to add missing details around you, and the types of quests available are very broad. Arguably, you can't fix things with it, I heard there was an other app on F-Droid to do this but I haven't tried it yet.
"Arguably, you can't fix things with it" - you can fix certain things, thanks to resurvey quests that were added.
For example resurvey of old opening hours data, recent version (v28.0) added also ability to directly handle shop that is gone and replaced by another (it may not be released for you, especially if you use F-Droid). See https://github.com/streetcomplete/StreetComplete/releases/ta... for details.
Ah yeah you're right, I did install the v28.0 version and forgot about this new feature.
Also a big thanks to you for your work on this app, it makes editing OSM super easy on the go, and gave me something to do on my walks during the lockdowns :)
What I would love to see would be an app allowing me to quickly contribute to OSM, e.g. fix things, add street names or POIs, etc.