Can't get past a particular Conquest fight

I'd have thought that your Phoenix could take out that team in normal mode.  If you're really having trouble with it, you could buy some consumables.  Also, you could put your best mods on the team to clear that battle.

On your modding, it could improve a lot.  You may wish to watch some youtube guides on modding, it does make a difference.  In the long run though, you need to start looking at unlocking some mega characters.  Legends, Conquest dudes and Galatic Legends.  Your roster is distinctly lacking in gold medal winners.

Thanks for your help.

Ally Cde: 327925915

The star destroyer is from Starkiller getting to 100 stacks. You can read kits to find your own way around this, or find one of the counters online. Unfortunately, it's a little hard to help with specifics without knowing your roster. You could post your swgoh.gg link and someone might be able to toss out suggestions for you.