Currently, the situation of the market is down. It means, this is the right time to invest and hold until the price is rising to get a profit. To all holders of cryptocurrency, always believe that the price will increase soon.
Buying low and sell high it depend on what coin are you buying. If it just a shit coin token then i dont think it will rises. Pick only that really legit for a long term. I loved long term invest cause i hardly to lose my money with it.