Stuck..

So, i finally became Level 53. Super happy because i can finally start Cantina Battle 4.. But im stuck already, i keep dying in the first mission of 4. What im doing wrong?

My Squad:

Sidious, 4* 53 (L)
Chewie, 5* 53
Lumi, 6* 53
GM Tarkin, 4* 53
A. Ackbar, 4* 53

My Reserve Heroes:

Boba Fett 4* 52
A. Ventress 4* 53
Poggle 4* 52
IG-88 3* 46
Talia 3* 46
Phasma 3* 44
Luke 3* 44
Geo 1* 42
Jawa 3* 36
Tusken Raider 3* 36
JC 2* 35
Resistance Trooper 2* 29
Ewok Scout 2* 20
Snow Trooper 2* 20
Clone Sergeant P1 1* 20
Coruscant Underworld Police 1* 20
IG-86 SD 1* 20
Royal Guard 1* 20
FO TIE Pilot 2* 1
《EDIT》
Poe 3* 39

Already, thanks for help 《♡》