For finding cycle paths and quiet roads, I can highly recommend https://cycle.travel/map - it doesn't find "scenic" routes yet, but I think the author has been planning to add that :)

You might try TrailForks instead for biking and scenery. But I haven't seen a map software that does specifically curated scenic routes automatically, that sounds like a pretty hard problem to be honest. How would the map know what is scenic and what isn't?

For those kind of routes I still rely on random blogs or known good directories.

For me, switching to bike route mode froze my phone. Not going to use this I guess.