The most important thing here is to keep up with your routine. Don’t fall into the rut of waking up whenever and not taking a shower, etc. Go about getting ready for the day like you would any other day when you’d have to go to class. Set aside the class times (if they’re not already filled with video lectures) to do actual work. Finally, make sure you keep up your social life to the extent possible. Make video chat dates. Plan a virtual cocktail hour (if you’re of age). Or do what some of my wall helpers are doing an learn how to play D&D with friends virtually on roll20.net.