Have you considered joining a local club or organisation? Many are still carrying out activities, although it may be in a more limited way. You may want to become a member of a local photographical or history society, or join a sports club. There are so many to choose from – 3VA the local Council for Voluntary Services has a list of members.
Volunteering is also very good for your health, you can look for opportunities in your area on the Do It website or you may want to join in with a local litter pick.