Ever since I've got into cryptocurrency, I've had several experiences on the prices on some of my holdings achieved ATH's in a matter of months alone especially on the 2017 bull market and was thankful I didn't sold out early when I got them. Having had a positive feeling about it, I became reluctant to sell some of these cryptos even at the height of its price thinking that I may gain more from them in the future and also believing that this projects have very good fundamentals and does have a room for growth!
Then at the beginning on the 1st quarter of 2018 (which started the period for bearish market), crypto prices nosedived sharply and in a matter of weeks my portfolio begun to shrunk and was reduced significantly but then again I was overpowered by my belief that crypto will have an eventual rebound in which I was wrong! Over a period of short time, I was forced to sell those cryptocurrencies at a significantly lower price and accepted my loss which led me to believe that hodling is indeed a form of gambling and thus has a risk / reward factors associated with it.
Until now, I don't have any regrets but only have lessons learned from this experiences and will remain having a positive outlook on cryptosphere because I know gambling will let us "win some and also lose some".

I know some of you had already been on the same kind of experience just like me.

You are not the only one that witnessed that episode at the time but outrightly saying holding means gambling is to the extreme. Everyday we take risks even outside crypto. For stepping out of the bed in the morning is a risk because you don't know whether you will miss your steps or even have an accident along the line. You go to work, its a form of risk because you might get injured, arrested, accused of something you didn't do but that does not mean you stop going. Its a risk but it doesn't mean you have been gambling with your life.
Gambling on its own is a conscious activity carried out because you want to increase your returns by wagering some amount of money in return. In the case of holding, you are not risking any fund, you only have unrealised profit or losses by the funds in your wallet which does not increase one bit. Its the circumstances that surrounds it that makes it look like gambling but its simply taking a risk.