Yii2-user is a very popular Yii2 extension for user management. There are lots of forks and contributors. Many issues and PRs are awaiting for being integrated or at least answered.
But there is no activity from the repo owner since over 3 months which is very untypical for him compared to his activity before.
Currently I am sitting on a fork and maintaining my branches. This works for a short time but I do not get PRs from the others and cannot sync with the original repo anymore.
What is a common practice to make a repo survive if the owner abandons its repo (and cannot be reached)? How to proceed as a single fork owner and as community of all fork owners?