Help/Guidance With an Exit Strategy

Hi everyone, fairy self-explanatory but I am looking for some help and guidance with picking and locking in an exit strategy. I watched the price of BTC and Crypto as a whole go to ATH’s in 2021 and then watched it all the way back down again.

I feel this time I would like to have a plan in place to take some profits etc. I was considering something like “sell it all once BTC hits $100k” but I’d like to know is this too simplistic?

Anything else that you all might think would work? All replies and help appreciated !