In regards to FITD, I think we move forward with how Suicide Tennis is doing it.
Replace the 2019 results from tournaments that are still played this year no matter what. As we don't have any travel restrictions the most important ATP argument for doing what they do doesn't really matter to us. For all tournaments that aren't played anymore the 2019 result will be counted until 2021. Year-end-rankings will determine the WTF participants.