You are not meant to force people to remember you. Stop calling people to complain about them not remembering you, that's totally nonsense.
Why would you called friends to ask why they stop calling you. Just by this behavior, you are proving to them they were doing the right thing by neglecting you.
Whenever you notice a change of your relationship with people, just adjust and accept the current reality without panicking. That shows you are matured enough. Life can happen and people will change, sometimes for good and sometimes for bad. Just know that nobody owes you a permanent conversation or companionship.
Have you seen a person who forgets foods or reject money? Never. Food and money are very vital and important, everyone who always remember it. If you are worth something in the life of a person, they will never want to forget you. And if they forget you, just know that your presence in their lives is no longer valued.
Instead of nagging over people that have refuse to reach out to you, go and work on yourself. Become a better version of yourself that people will find it hard to neglect.
