Buy where you see value in what you understand and find value and use in. Have a (good) reason to buy or sell.
Like when you need money at the time, right? I agree
The decision to sell bitcoin at this time if you want to take profit is a good thing, but if you want to invest more long term then you can completely keep bitcoin because at least in the next few days bitcoin will reach a new peak and I think You can hardly buy bitcoin at this time. The decision belongs to you should have a reasonable investment for yourself.