Don't focus on what you can't control but the things you can. Try to maintain some kind of routine, go to sleep and get up at reasonable times.
Use the internet to continue the things you enjoy - plays, films, talks, music, comedy, games etc are all easily accessible. Friends and family can be seen as well as heard and allow for some fun and relaxation. If you have children at home then still aim for a bit of me time if you can.
If you can go out in the garden or for a walk, being outside in the daylight can boost your mood.
And of course eat well. This is a good opportunity to find novel ways of using things from the back of your larder or fridge . As food shopping is not very enjoyable at the moment make meal plans for the week and make a list, it will help you to get what you need and home ASAP.
Stay safe and keep positive.