A suspension of the season for a month or 2 and reassessment would be the best bet.
If we want to finish the competition off this season, I think have to do it now. I'm not seeing much expert opinion that is saying in a month or two things will be better.
Make sure the squads are isolated from general public so they don't contract it, and go on in empty stadiums.
Otherwise realistically could be not finishing the season, or could try finish it with different squads down the track which would be a farce.
I just don't see what the pressing need is to finish the league. I mean, much more commercially and socially important events (including pretty much all the biggest events in sport from every significant football league in the world, EUROs, Copa America, NBA, golf and tennis majors) have been postponed/suspended/cancelled, but it's really critical for the A-league to finish the season? Do we honestly think that?