The most important thing to sustain one in a long term hold is having another source of income. I wonder at some people who talk about hold especially the newbies but then again they might have other sources of income. Only that will give one courage to hold one while expecting a believed project to do well in the market. The other points the poster outlined also is of essential too.
Definitely that's important because investing alone can't be a guaranteed source of income especially in crypto where the market is very unpredictable.
Maybe in the past it's easy to be profitable because even if we hold 6 months, there's a high possibility that our investment will be doubled but people got a little greedy during the last bull run and they don't sell and resulted to holding until now where price is very cheap.
Every holder are not expecting a long bear market, but like I said, the market is very unpredictable so greediness will likely kill our source of income if we don't have one that is not risky like having a job or having your own business outside crypto.