When I came into cryptocurrency, I was adviced same not to hodl for long but there was one day I regretted selling my bitcoin. I sold it worth $400 and the next day,it has shoot to $550 which really pained me

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I can't even believe the prices you're talking about. That kills me too man, I'm sorry...
I will hold my coin for several years. until the coin price will rise as I want to be able to get many benefits for the needs of my life.