Good strategy?

Hi. So I bought some solana a few months ago and am currently about 350% up on it. I am thinking of selling a third to cover my costs. The rest I would leave to go higher and then take profits.

My thinking is that if I cover my costs and the rest crashes, I am on net 0 and not in a loss. And in case it goes even higher, I still have profits (even though they would be a third smaller - I am OK with that though.)

Is this a good strategy? Am I being too careful, or am i thinking correctly?

Thanks.