That’s way too much - your biggest priorities should be to sort out your Arena Rank and Fleet performance to get you more free crystals.
Fleet is easier as you have some reasonable ships! Pilots gear level is key - to unlock their Omega abilities you need G11+ Focus on getting Biggs, Slave 1 and Tie Advanced in particular to 7* and pilots to G12.
I’d suggest you focus on your Rebels and Jedi
Complete your Phoenix Team - Hera & Kanan to 7* —> Unlock 7* Thrawn
Farm Old Ben and Farmboy Luke - Gives you the requirements for CLS and another Decent Jedi.
Farm Bastila and QGJ (QGJ is easier to complete and you want 5 7* jedi to get GMY at 7* ASAP)
Your Arena team targets (pick 1)
- CLS, R2, Old Ben + 2 Rebels
- zBastila (Initiative Zeta is so good), zGMY (Battle Meditation), Ezra, Old Ben and Kanan*
*Kanan will be replaced eventually.
As for Darkside
Thrawn at 7* will improve your Empire
BHunters - start farming Dengar ASAP if you want Chewie, also Prioritise Greedo and Cad Bane ahead of IG88 (who is a liability on Chewie team). Last spot should be Bossk (Farm after Bastila if you go for Jedi).
If you are after 7* Chewie the lineup above need to be G11+, zeta on Bossk and decent mods. As you can see this is not an easy target. You should also get in a Guild that’s farming Heroic Rancor and HAAT to get Han and GK to help both teams - they will boost both teams.