I'm not overwhelmed by these songs but I think the best one would be Na chystu vodu by Funkinbiz. It's very pleasant and chill. And I think it's the more mature songs in the selection.

Kur by Vēstulēs would also work. The only other acceptable songs would be Hollow by Dons, or The Cat Song. I never want to hear The Cat Song again but I do want everyone else to listen to it.

The other songs are a little gimmicky and juvenile. They'd get destroyed at Eurovision, and I really want Latvia to break their non-qualification streak.