What would you like your life to look like? If you could imagine a perfect day, or week what would it be? Obviously it won't magically happen, but there are certain things you could incorporate into your life.
You mention social groups, but what about friends - do you have many? Can you reach out to them and go for dinner and a catch up?
What advice would you give your son if he said the same to you? Possibly to keep trying new things until you found something that clicks...
What did you love as a child - horse riding, knitting, roller blading -whatever... maybe try rediscovering something you used to love.
Unfortunately, things aren't going to just magically change, you will have to make the effort and take yourself out of your comfort zone.
This is something I found on another thread that I copied out:
Imagine the woman you want to become, think of what her daily life looks life - her habits, her routines and her actions. Start showing up to these commitments, start building upon them, step by step, day by day - you don't become her overnight, you build her.
Although, having said that, If you lack motivation for everything that could be hormone changes or something else. Do you have any other symptoms that could be related to perimenopause?