Base on the title, I will start by saying that nothing last forever, and there is time for everything. There is a time to buy coin/token, and there is a time to sell coin/tokens.
This buying/selling activities come with either profit or loss outcomes.
The Bull run may continue further in near future but will definitely pave way for the bear run at certain times. As you may know, Bitcoin has normal circle, precisely four years, it is evidence that the trends goes with it's circle, though there may be few months that we may experience some changes due to certain factors like demand/supply.