If you have these three you're in the right mindset. If you're feeling anxious, greedy, depressed or any kind of extreme emotion - leave and come back tomorrow.
This is probably the right mindset we should have as long term investor, its always going to be buy low sell high. Doing it can be a lot harder when one can't controll emotions and it could take over when the market changes drastically.
Because it often happen to me like deciding to sell abruptly, I tend not to watch the markets of the coins I intend to hold for long term particularly the ones I have been staking.