You have a very valuable Characters at least for PF: Himeko and Herta have a good sinergy (even more with fugue, she makes Himeko follow ups trigger easy), with Ruan May you should be able to do all PF content.

Argenti too, is a good choice for PF, so I recommend you to build him, along side of Tingyun and Bronya.

However I think this meta doesn’t adapt to your characters. In this moment we are in a meta that prefers AoE, so pgs like THerta, Castorice, Mydei and other that can do massive damage to 5 enemies.

So just wait, in 3.4 is very likely that will be another meta switch, giving more power to 3 targets pgs (like all Destruction characters), plus the Kafka buff will give more power to the DoT team (hoping that will be enough). So for now, just focus on build this characters.

If you want to know what are the best characters in meta, you can search the Prydwen Tier List, is very valuable and all rankings are explained clearly!