Dash lead, L3, Vandor Chewie, Young Han and Qi'Ra will be very interesting. Vandir chewie will be tough as a whole coffin with that extra max health from the unique and lead prepared bonus.
Dash's basic and his AoE are absolute mobstrous TM trains with his unique. 3 hits on 5 enemies that cant be evaded, thats 15 hits aka 30% turnmeter which should not be neglected.
Qi'ra getting extra speed will help her greatly. Combined with her unique, thanks to Dash, she will go haywire with all that TM from multi attacks.
BUT this team is evidently zeta heavy. You will at the very least need young han and vandor zetas. And Vandor should be as high relic as possible for all the health.
This team will definetly see improvement, even if it still wont even scratch top teams.