If you don't want to look on this thread a few years later, and laugh for considering $20k expensive, I recommend you buy back. Selling bitcoin at $17k with $20k as current market value doesn't seem a "huge mistake". However, if the price doubles, triples etc., you're about to regret it.
Also, rainbows make sense until they're broken, same as with S2F.
Well, I dont see it a huge mistake too because for me, its like a common mistake everyone is doing. You just have to be patient to wait for another dump price and it will be very possible this time since we are still in a bearish market. Bitcoin may seen pumping at the moment, but believe me it will always fall back again at any certain price. Thats the time youll decide if it will be a good price to buy or just wait for another dump price.