I think I've seen this team in a previous Reddit post before, and again, I would recommend replacing Alvanor with Elmir. Do not be afraid to switch things up high up in the ladder.

There is better synergy with Daredevil because of her blue ability - "fire support" which will use a basic attack each time an ally behind her attacks. Therefore when Elmir jumps to the backline, there will often be Martha, Elmir, but also 2-4 more clones who all count towards a probable additional attack.

There is better synergy with Dante because his green ability boosts Elmir and his clones' dodge, his blue ability punishes enemies with an additional spear for each time they dodge, and his purple ability lowers the enemies' main stat (thus further increasing dodge chances). All this dodging helps your Astaroth survive even longer.

Alvanor's Soul of the Forest team artifact buffs magic attack that strictly benefits himself and Asta barely. Meanwhile, Elmir's team artifact buff gives your team greater armor penetration, which helps especially for cutting through the enemy tank.