Hi OP - I’ll let others comment on your roster and teams but some general survival tips for GAC:
Study SWGOH.GG to see what the current form teams are on both offence & defence
Ditto for counters - it’s a good dataset even if you don’t always have the roster depth to make best use of it
Don’t be surprised or put off if you encounter much stronger rosters - the ladder system means less active players can drop down the leagues and results in some very asymmetric matches. It is what it is and if you’re lucky you may occasionally win a mismatch. Most importantly don’t get frustrated
A 50% win rate is a good result in GAC - in fact 4/9 wins is ok too in effect. Especially early on that means you’re doing fine
You get reasonable rewards even if you lose - as long as you take part. Always have a tonk even if it looks inevitable
Use every encounter to learn something
Use every event to have fun
Enjoy the new possibilities