foxglove, your father died less than a year ago. It is far too soon to start making plans about things you will do in the future. Widows are always recommended to wait at least a year after the death of their husband before making changes in their lives, and the same applies to you.
As others have pointed out, if you are 51 you are at the peak time for hormonal changes during the menopause and again that is not a good time to be making major decisisons about the future. Then of course, if you are 51, your children can only be in their mid-20s at most, the age when everything, jobwise and relationship wise, frequently changes completely and without warning. Again, others have said, you could move to be near them, only for them to move away, because a new career/better job/new partner has changed everything. And then there hsd been COVID
When you loose someone dear to you like your father, it is quite common for the grief to open new channels and bring other worries to the fore, so that you think that is the problem, when it isn't. Grief is a very strange and wandering emotion.
I think you need to find another focus for your thoughts, perhaps look for new outlets and actitvities. Something as simple as going for a swim every week, or doing an eveneing class. take small steps.
You also sound depressed. I suggest that you try to see your doctor or find someway of accessing mental health support, or through counselling