Agree that maps is one of the harder ones to replace and I’ve settled into a few different apps by use case.
Here WeGo has been a nice compromise of having a solid search function, good routing, offline maps, some reviews via trip advisor, supports my local transit system, and has a sane privacy policy even if its not FOSS. Can also save locations accountless.
CoMaps I use as my main offline walking/biking and would love to see the team make more improvements over time.
I use GMaps WV for the random times I still need to use GoogleMaps usually for looking up reviews or as a backup when other maps fail me.
So really Here WeGo is the closest one to one replacement but I still use the other two as the need arises.
On a side note but related, https://github.com/kmille/freetar is a private front-end for Ultimate Guitar that’s amazing. Free public instance at freetar.de.
Never went back to UG after finding this, so much better than navigating their awful website.