It might have occurred that once you sold that stock, it doubled.
It’s happened with me, too.
To arrange my higher education costs & to accommodate 6 months expenses, I sold Infosys in 2017, made 2x, only to see it become 4x by 2020.
Sometimes, we unknowingly sell our best holdings to minimise risk.
Though selling our best holdings in itself brings a risk of missing out on the later stage gains.
Usually, when an investor who is making a 10x returns, the 6-8x returns would come in the shortest period of the time.
Compounding at the tail end periods brings in the maximum returns.