I used to experience that feeling when I bought BTC at $ 2k8 in 2017 when it went up to $ 4k I sold when it was profitable, but it continued raising to $ 19k in December 2017.
I remember that very well. People were calling the top at every round price level ($3k, $4k, $5k and so on), but they ended up seeing the price go up much further for the rest of the year. It must have felt bad after having sold so low.
The funny thing is that people did the same on the way down, where each round price level was said to be the bottom.... reality was that we didn't bottom out until we nearly hit the $3k mark, where people then expected even lower levels.
That perfectly shows how irrational the crypto market really is. It goes up and down well beyond what people consider over/undervalued. Never underestimate the risk of investing in crypto.