Just sold 5% of my Bitcoin that I've been holding for 3 years and I feel satisfied doing so.
I didn't need to sell, and it was mainly for the satisfaction of getting back some of my original investment.
However, I also feel like its broken the "HODL AT ALL COSTS" mindset which I felt was getting a bit unhealthy.
I do feel there are risks with Bitcoin, and I won't drag people down with that here, but I will be diversifying that money into gold and shares, mainly tech shares.
If Bitcoin dips a lot, I will also buy some more Bitcoin though.
Basically, I'm glad I sold some if only to stop feeling like a slave to it (and to test the Coinbase selling functionality which only took seconds for the transaction).
My first selling is 20% of my total asset mate , and same feeling as yours .. also i convert almost 70% of my altcoin into bitcoin after that selling because i think it is more worth holding that Shitcoins .
Selling when we have made a big profit is the thing to do, bitcoin can go down at any time so when we sell and already make a profit then it is the right thing, I first bought around 1.2 btc in 2015 when the price was around $240, and I immediately sell when you get 15% profit, for me this is a big profit in 3 months.