Holding bitcoin for a long time is both good and bad. It is good if you have plan or target price to sell it. It is bad if you just hold it without having a future plan for it. You don't have a target price to sell it. You just want to sell it at a very high price but no on one can say how high it will be.
A target plan is always necessary for all of us, once we are holding we should have a definite target for us to be able to do the right timing. We should always be careful with our greediness as when we see there's a big price increase we think that we will earn more but not really, what if the price crashes hard?
I think a target price is important but investors should not be very firm about it. If they see prices increase then start to sell it but dont sell it all. Make sure to hold it, you never know which is the highest point of increase. If you sell out small fractions as prices cross your target price you can keep gaining profits. Even then make sure to have some spare capital left so you are not empty handed after the day.