The general strategy is 80F is really just capping out your atk debuff and have some def buff. This should mostly cut the damage you take each turn to under 2k.
Apart from survival, the best selection to use are girls who are capable of hitting slash and pierce weakness by default, so Kerria/Water Lily RG/Enotera RG will do very well here.
Any 2x skill act next turn buffer will make your life much easier here, bonus point if they can offer turn based atk or dmg buff, likewise if your debuffers can offer the same.

If you feel like you're lacking in atk buffs, you can consider using max LB'd 4* Solar->Atk FM, they're 15% atk each. Just stall shine drop on another map before attempting.

Here are examples of my debuff parties at 80F, general clear and the other is a full 10k pt clear.
https://streamable.com/px6fsz
https://streamable.com/mnh3zp

23F was also the floor where I used to heal up as well as fill shine drop.
https://streamable.com/ws0sgn


Overall, it brings the spotlight back to defensive girls. Skill act debuff that is viewed useless outside has plenty of use in tower, such as the example below.
https://twitter.com/kahuleinninryou/...10596571811840