Automatically inferring / refining hiking trails in OpenStreetMap from multiple GPX tracks – existing solutions?

[Hungerburg (Asa Hundert)]

@KRPark

a project that collects dozens to hundreds of hiking GPX tracks

That is not a lot. Unless you meant, of the same trail.

@Jofban

Visiting the place and mapping it according to survey.

From my point of view, that is the OSM way to do it: Visit the location. I’d expand: map to survey and anything else available, eg. Strava, LIDAR, aerial come to mind.