Has anyone else forgotten their first language and relearnt it?

I'm trying to relearn my first language (Swedish) which was forgotten when we moved countries as a 5 year old and started to only speak English.

Has anyone else been in a similar situation? Did you manage to relearn your first language to native like fluency?

I've been trying to relearn Swedish and I'm really hoping I'll be able to become fully fluent and regain my accent in the language. Sometimes I feel like it's just a pipe dream.