Make sure that you let your bar drop to the lowest it can before you start your combo. That way you maximize your misses. After you finish your combo, try to always keep your bar half way so that you don't accidentally fill it at any point. When it gets near the end, you have to try to end with no bar whatsoever.
It's possible to get 215 misses, so don't feel like it's impossible.
What I did was miss the first few arrows and then start my combo off at arrow 9 or so, get my 214 combo, and then tried to essentially AAA the left half of the song (unless my life bar got severely into the red, in which case I just hit an extra arrow on the right side to keep me alive). Then at the end you have to try and calculate a way to get your life bar to be 0 when you miss the last 2 arrows, they move slow so if you remember how many jumps you have to do...it shouldn't be too bad.
Here is a replay of me doing it so you can see what I did better:
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