Douple encirclement. The guys in the south in that small pocket, and Avdiivka itself. If AFU isn't doing it already they really should get the guys out from both.
I think both regular and guerrilla warfare experts agree that the hardest test for an army is breaking out from an encirclement.
Heavy losses unavoidable.

I heard - perhaps on Military Summary yt channel - Russia started to use personal electronic warfare equipment to scramble drone communication. Just one dude can darken a 100-150 m radius. Supposedly this is one of the keys to the success at Avdiivka. Proofs: no drone footage from the area.
But I dunno one thing: how their own drones operate?