Vilnius has a very nice old city centre, great food and very good beers. It's pretty cheap and might fit in well with a round trip in the baltics. Haven't been to Latvia or Estonia yet, but the people I know that have been, have been pretty positive about it.
CachyOS is making my old ass 2012 desktop feeling snappy again. I'm by no means a pro user and everything seems to work and god damn installing and updating stuff is easy and fast!