but however after this bullish periods, will the price of Bitcoin continuously swim higher or it would eventually drop down
We will never know. Typically as the cycle goes on, then we will have to go through a bear market which always comes just after the bull run. But we don't know if this cycle will be different than the past ones so, we have to idea yet. If you are long on this market, you have no need to think of it and be problematic of what's about to come. We will just see new highs and lows soon.
become bearish for investors to buy the dip and hodl again?
If you want to stay, that's just what you have to do. Rinse and repeat.