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People really make selling your hodlings seem like a punishment and there were times I felt bad whenever I had to sell my coin even when I'm in some form of profit and this was because I felt I wasn't doing the right thing not until I held my ground and realized it was my possessions and the decisions to sell or hodl are mine and not someone else's to make.
It really should be stated out the type of hodlings and I think first one you mentioned which is buying some coin and coming back after some few years is the best but can mostly be achieved with greater possessions so as not to get liquidated no matter how bad the market might go against the hodler.
Bitcoin is a deflationary asset so we expect that it will cost more in the future so FOMO will say that we could earn more or buy more, and it will be all the time! So it is good to understand that it is just possessions and you can use it when you like. In the places with a clear division of the seasons we know that some agricultural products will cost more in the winter than in the autumn, but we eat them when we want and not wait until they cost the most to feel we use it the most profitable. The same should be with bitcoins IMO, to use them when you want and not when it is ATH.