"A player at your level"? If this is one of your accounts:
https://swgoh.gg/p/887344419/characters/
.... I'd say that you are doing quite well for your level (3.2 million GP). Yes, you don't have any of the strongest teams for challenge tier Rancor raids but contrary to your claim you have viable teams for all other new content:
You already have 3 viable teams for Republic Offensive (LS Geos TB). You skipped a couple of the "usual" teams for Separatist Might (NS and Traya trio) but nevertheless you have enough viable teams to do your part in your 165 Million GP guild. In a guild at that level you don't need to take your characters/teams to g13 for them to be viable in TB/TW. The same goes for you personally in GAC. I'm sure your characters at g12 (or even a few at g11) can do their job in GAC.
Yes, you would have a long way to go to unlock SLKR or GL Rey since you've skipped farming FO and Resistance characters altogether until now. However, it looks like you are farming for SEP and are rather close to having all the required characters ready for him. Not bad at all at your 3.2 million GP. However, relic'ing characters like Tarkin, RG and Krennic while still having DS at g12 and Veers/Starck at purple gear levels hurts you in GA - but that's a different topic.
Getting blown up in GC? No Mando Beskar available for GC? You just had a GC where you could easily get the top tier rewards crate with your roster. You are probably able to get the second highest tier rewards in most other GCs. Again: Quite good at 3.2 Million GP.
What more did you expect for "a player at your level"?
