Since it’s OSM based then you, yes you hanging around at the back of the class, you!, can make the changes yourself. Just create an OSM account then edit accordingly. Obviously be mature about it - upgrading someone’s private driveway to a public road isn’t clever.
The next time Strava (or Komoot, Garmin, TomTom or whoever) pull the base data and regenerate the maps then the changes will appear.
Edit: the OSM map editor takes a bit of getting used to but there’s a lot of complexity to deal with and it’s international in scope so some of the options may not make sense in your locale. There’s a help wiki for each classification you can modify.
@CatCryRides - that error looks like the track has been marked private for all vehicles but it then needs marking public for cyclists, horses and foot traffic. (OSM markup works from the general to the specific. In this case you restrict everything then allow those classes of traffic required. This is sort of opposite to how we’d say it: “The road is open to pedestrians, cyclists and horses only”, OSM would say: “This road is closed except for pedestrians, cyclists and horses”)