As you said, I've also always known first months of years to be quite crappy for BTC. I expect a little short term consolidation soon, but overall.. I think the bull run has only just begun.
That's right. We can't expect this bull run to be forever. So at some point, it will go down. But when? No one knows. So in order to prepare for what's to come, you should have some sort of plan to optimize what's happening in the btc market. One can sell some of his portfolio just to make sure that you took advantage of this price level. We can't say if we are in a bubble or not, because the use case of btc today is different 3 years ago.