I deeply regret spending my BTCs which I earned in campaign signatures way back in 2018. If I did not spend any of it, I could have at least saved up to around $20,000 today. Lesson is- do not spend your BTCs!
You can literally say about all the coins in the market. I had the patience to hold the coins for a long time and i invested in the hype market as well in tokens which burned my hand but one of the biggest profit i had is in the ETH market during the last rally and then i did not bother to invest in it which is a regret. The recent spike in Doge was also surprising and i booked my profit and waiting to enter the market.