I sold at about $55k. To be exact, it was the day when Ethereum reached over $4k. Bitcoin at $1T marketcap, Ethereum over $4k, all friends & neighbors into crypto, Tether printing billions in hours, and even my portfolio at an unimaginable value. It seemed unreal so I made my decision.

About buying back, I've said it before a few times and will say it again, as soon as 200-week moving average is touched:

https://www.lookintobitcoin.com/charts/200-week-moving-average-heatmap/