earlier this year I tried to hold some coins and tokens but saw the market and the exchange getting downhill, what is the best move to sell it or hold it?
Sale in panic - the worst that you could make after market crash. It is better not to do practically nothing. Absolutely anything.
If you hold now, there is a good chance that in the long term you will see that your portfolio grows in the price. Long-term investment offers access to ampler opportunities.
If you carry out a survey and try to identify the most common reason of the loss which most of the investors have suffered so far, then the only reason which you will get to know will be none other than that of getting panic at time when the market values were falling and then selling out all their coins which then resulted in a huge loss of their money. You need to stay away from any such thing to save yourself.