As much as I'd love the Project Restart to succeed, as soon as at least one player tests positive the whole thing is probably going to be called off again, odds are it won't be safe to play football until vaccine is developed.
In any case, how'd like for the season to finish -
Null & Void - no champion named, no promotion or relegation, new season starts as if 19/20 never happened - what do you do with newly broken goalscoring or appearance records though
Complete it based on certain criteria - criteria such as current standings, points per game, simulate the remaining fixtures on football manager etc
Restart until certain date - try to play the remaining games until August/September/October to lesser the impact on 20/21, abandon the season if not possible
Restart no matter the timeframe - don't start the new season until all remaining fixtures for 19/20 have been played no matter how long it takes, the football calendar is fucked anyway due to Qatar 2022