Well some people just dont have a choice. They might have bills to pay and other needs, HODLing is just not an option for them
That is the reason experts always advice you should invest only spare money in high volatile products because sometime we may need to wait for quite long time to see profits in these investments. If you invest money which you need it immediately then your forced to sell at a lower price if prices go down after your investment.
5. study the past history of market value ( when holding or investing and even trading)
Past history is only for reference because there is no hard and fast rule that in future also markets will follow the same way.