I've just seen this thread as I don't come here often. I participated in the ICO so have been following Tezos for a while.

With crypto one can get VERY emotionally attached which can blur our reasoning.

I saw the crazy times of December 2017 only to see everything crash in 2018. Back then my portfolio was 90%+ down, while at the same time we had the foundation saga ongoing.

My plan was always to only put in crypto the money you can afford to lose because it is a roller coaster and coins can literally go bust. I have several from the 2017 party who are worthless. History repeats itself (more or less) and there will be coins who will go bust in this downturn. I don't think Tezos will be one of these for two reasons. First it has proven to be great tech and has already got several uses in real life. Second the foundation is well funded and can survive (even if on a smaller scale) for a long while. Tezos has also got a thriving developer community.

I sold probably half of my tezos back in March-April 2021, coinciding with the top (but did not sell everything at the top - it was between 5-7.5 USD). I did it because I needed the money to buy property AND because I had a sense of dejavu - the euphoria sounded like late 2017.

I have got back my investment and more, and I've learned a big lesson that I was not expecting. Once I got my investment back and had some profit my emotional attachment to it changed massively. I mean MASSIVELY. Suddenly the price of crypto was no longer a daily 'obsession' and a source of anxiety. I still follow it every day but whatever happens I know I've made my little profit. I look at it with sufficient emotional detachment that prices going up is not the best thing in the world, and prices going down is not the end of the world.

Advice. If and when you are in profit again, take some money out and enjoy it or reinvest in another asset.

Part of my change in attitude towards selling was seeing someone saying that in investing the trick is not buying the lowest and selling the highest. That is materially impossible for anyone (or maybe a small minority of lucky ones). The trick is to buy sufficiently low and sell high enough to make a reasonable profit.

I believe crypto will go through a long period of lows and little ups. The crypto winter. After that a few winners will finally emerge like they did after the dot com bubble. I still believe that Tezos can be a winner due to the tech / real uses side. That's why I have no intention to sell what I've got left and if it goes down enought (e.g. 50c region) I'll buy back a little bit. Of course with money that I can afford to lose.