This can only be done by yourself because money is your own. According to you said you bought bitcoin in March last year, and then sold half the BTC at the end of last year. I figured your money has already been taken out, and the BTC in your wallet is all zero cost. In conclusion, my suggestion is holding.
Yeah clearly you're overthinking it because of all of the negativity being spread around about dips becoming drops becoming crashes or whatever. If you're at a comfortable level that hasn't caused you any harm, then sit down and chill out. There's no need to panic because the market is taking a break from a huge leap from last year. It needs to rebalance itself once again. Who know what will happen next, it could go higher, or just make a half-hearted run up and get stuck in a range.