Help me figure out where to spend my Jades

Hi all,

I've decided to use Acheron for as long as I play this game, but I'm having difficulties figuring out how to vertically invest from this point:

- Acheron E2S1
- Pela E6 Resolution
- Aventurine E0 Gepard LC
- JQ E0 Solitary Healing

The first thing that comes to mind is Acheron E6, but I was wondering if there was a more cost effective way to go about it: This could mean LCs or Eidolons for Aven or JQ etc. or even Tribbie E1S1. If there was a roadmap for which to prioritise that would be very helpful.

The other alternative is to invest in my other team (E2S1 Firefly).

Any advice would be much appreciated.