I empathise completely. 50+ years of work and family and then retirement just after covid. Sadly my health deteriorated further ( I had given up work in hopes it would improve) ,bereavement and cost of living crisis came along. At first I did not know who I was. My clothes,eating habits and everything belonged to someone I no longer am.
Luckily for me I found I could no longer afford to spend much. I began to cook and experiment with cheaper meals and found I loved cooking ,even just for one. This led me to an interest in all sorts of things. Where food comes from,climate change, recycling . I have learned to sew in order to repair and remodel old clothes. From being ( I admit it) a bit extravagant, I havev had to become a dab hand at saving. I have no garden but grow herbs and peppers on the windowsill.
I feel calmer ,more content. I meditate,listen to music and read . I find I have learned so much and need far less.
I cannot afford luxurys like holidays but I don't mind.
Family history is a lovely idea. Are there local book clubs or craft groups that are accessible? Hope you find lots of new interests. I am sitting in my room that looks like a jungle with 15 healthy house plants. I used to say I only had to look at a plant for it to wither and die and then I bought a basil plant as I had taken up cooking. I can't stop now, but am running out of windowsill room. Good luck .