Boss preparation is easier when you separate damage from everything that lets you stay alive long enough to use that damage. Movement, recovery and arena layout often solve more problems than another small stat increase.
1. Give yourself room to move
Build enough clear space to react instead of fighting terrain and the boss at the same time. Reliable movement lanes reduce accidental damage.
2. Check mobility before damage
Review movement accessories and your ability to change direction safely. If you cannot consistently avoid attacks, extra damage may not fix the fight.
3. Prepare healing and recovery
Bring the consumables you actually plan to use and make sure they are easy to access. A preparation checklist only helps if the items are present when the fight begins.
4. Change one variable after each attempt
If the fight fails, identify whether the problem was mobility, survivability, arena layout, damage uptime or unfamiliar attack patterns. Improve the weak point instead of rebuilding everything.