In your first few posts you mentioned living with chronic pain and being lonely, also having no one to talk to about your kids now that they’re grown up and them calling you but being self centred. If that’s your opener on a forum I think it likely that your kids are fed up of hearing you moaning and so are keeping their distance.
They still love you, but in your teens and twenties life takes some navigating and your parents problems are not something you readily cope with. It is common for contact to become less frequent.
You say you have interests but not what they are. What about joining a group (walking, or swimming might be good if you have issues with pain?) and meet people your own age. Try not to mention loneliness, pain, or go on about your kids on first chatting. As a member of such groups myself I tend to avoid members who are clearly emotionally needy or can only think about their family,
I prefer to talk about the hobby. This is my time now. How about you start by telling us about your hobby?
Adult kids are self centred, to begin with they need to be. The hard truth is that even if they live close by and keep in touch daily it will always be more about their lives than yours one way or another. Until you need care, but that’s a whole different thread.
My mum was widowed and in a lot of physical pain when I went to university and used to cry and open every phonecall (a few times a week, plus home for a visit every other weekend) with ‘I thought you’d forgotten me’…while never ONCE contacting me. I went no contact in my early thirties. There was no relationship left to save.