Ftp Tpp or fpp solo suggestions?

I have ever only played Fortnite.

I’m a little tired of Fortnite and was wondering if there are any games I’m not aware of that you can play solo without needing to team up with others?

I’ve considered pub g but it doesn’t seem really active in the US. I have never played much COD and feel I might be too far behind the learning curve to jump into warzone.