As some others have said, make a list of the little jobs or tasks that need doing at home and spend a day or two getting things done. Similarly, have a spring clean one day.
Leading up to new year I always like to spend some time thinking about what I would like for the year ahead. Can I afford a holiday, where would I like to go, would I take up a new hobby, when will I book some time off, what do I need to save for, should I take a training course. Doesn't need to be fixed, but I enjoy putting a loose plan together for the year.
As you live rurally, look up some local walks, perhaps there are rural pathways or routes you haven't done before?
Are you confident to organise a local meet-up? Local facebook groups, the website called meet-up, community pages - if you have the confidence to do it you could put a message out inviting others who are spending some time alone to get together. It can just be a walk or a coffee.
I also spend a lot of time by myself, through circumstance, not by choice. I try to orchestrate conversations through doing regular activities. For example I go through the supermarket checkout with a person on instead of the self checkout, and ask whether they've been busy, had a nice Christmas. Same in a cafe, ask someone a question. I go to my gym and make eye contact, drop a comment and chat. Stop to chat to another dog walker about their dog. None of these are meaningful conversations but it does involves speaking out loud to another person and a brief human interaction, which makes a difference when you spend days at a time alone.