Okay, but you can just pick a few games that look interesting there. It’s not different than random people recommending random stuff here.
SEGA AGES Thunder Force IV
Tengai
Samurai Aces
ESP Ra. De. Psi
Mushihimesama
Espgaluda II
Deathsmiles I & II
DoDonPachi Resurrection
Dodonpachi DaiOuJou Blissful Death Re:Incarnation
These are pretty good, either from my personal experience or from reading lot of recommendations through forums and friends. The best Shmups on the Switch are mostly ports of existing older games. I’m not sure if you play on another platform too, I just read you have a Switch. I played on emulators on my PC and on Steam, there are a few more games I am not sure if they exist on Switch.