If anyone is isolated and on their own, suffering with lack of contact from family/friends etc. A few tips below. I was used to it for twenty odd years (I used to be a submariner) Two or three weeks was a walk in the park, I was used to two or three months.
Routine is key. Set an alarm. Don't let your standards slip, so shower/bathe every day, shave etc every morning. Take your time.
Launder clothes and iron them.
Take time considering what to eat. Take time cooking it. Take time eating it and take time cleaning up afterwards.
Don't become fixated on the news, once a day catch up is enough.
Read that book you always wanted to.
Listen to them old cds/vinyl/cassettes that you haven't done for a long time.
What better time than to learn a bit of a foreign language. Likewise, take up them hobbies again that you've let slip, or take up a new one.
Give one room of house/flat a good deep clean once a week and rotate rooms. Everywhere else, hoover/dust daily as required.
Exercise if possible.
Try to limit netflix/TV/prime video etc for after your evening meal. Don't become a couch spud.
If busy during the daytime, the evenings will look after themselves. The days soon turn into weeks.
Something as a submariner we couldn't do, but contact as many people as you can every day. Phone/text/email etc. Checking up on people makes them feel better and will make you feel better too.