this is not good

Im not strong on MP serving for Valheim.. but these questions need to be asked

Iis the server yours? hired?. or you share serve only when your PC is running?

The game backs up the world on a fairly frequent basis; you can probably restore from backup and lose an hour or so, at worst.

https://www.reddit.com/r/valheim/comments/vssxdi/how_to_restore_most_recent_working_world_save/