Gaming Help me with defeating the 3rd stage Ansem in Kingdom Hearts Final Mix (HD 1.5 + 2.5 Remix)

[blubbermarble]

Hi,

I played Kingdom Hearts Final Mix as part of KH HD 1.5 + 2.5 Remix on my PS4.

I tried to defeat the 3rd stage Ansem in KH, but I kept dying for so many times. My level is 53. Can help? Should I level up or change abilities?

See my gameplay about my failure of defeating the 3rd stage Ansem:
See video between 40:00 and 1:25:00.