Well I admit.
When Bitcoin tanked down to 5000, 4000 and 3000 I sold about 20% of my Coins :-/
This was obviously a mistake ;-)
At least I still have ~80%

Weve all made mistakes, theres no point worrying about the past & things you cant change.
I wish Id bought a fuck tonne more at 3 figures.
Whats important though is that you have a stash now.
Prepare to be one of the new wealthy elite my friend. 2021/22 - watch this space.
First time I heard about bitcoins was in 2011 or 12 (can't remember the exact year). I client of mine was talking about it. In the same year (I guess) one of my very close friend (that time) who was a Forex or something trading was saying once out of frustration that instead of this trading job he should have buy some bitcoins.
I told him what is that and he said it's a digital currency and some blab blab things. I had no idea about what he was saying and from his move it was clear that he also had less idea about it.
Now imagine in that time if I would give it some times and learn about it. May be me and my friend would be one of the bitcoins celebrities.
We all do mistakes in life. Not once, not twice, every now and then.
Mistakes are a part of life, part of the process to grow up. My story is a Greek guy I know was a very early adopter, hes a successful poker player & property developer.
& only check the price in 10 years (this was in 2013).
I ignored his advice until 2014 then I bought & kept buying & buying & buying - AND HERE WE ARE