I have started going to country dancing after my husband's death.
All right, you probably cannot do so at the weekends, but you will get to know some new friends, who might, who knows, be on their own too.
If you live in the countryside, choice may be more limited than in a large town or city, where you could visit art galleries or museums, if you can get there, and can afford the entrance prices.
In a smaller place, going for a walk and greeting the people you meet, will make you feel a little less lonely, and after a while you may find yourself talking for a while instead of just saying Hullo, nice day, or the like.
I know the feeling of the empty h ouse and no-one to talk to. I have come to the conclusion that it doesn't matter what you choose to try, as long as it gets you out of the house for a while, preferably if not every day, then two or three times a week.