Buy every dip and sell it when it goes high? Well, it is something manageable but somehow we look also the market trend and not just of the price itself.
It gonna be a big loss in our part if we keep buying during the dip and never have any returns after then. We should be smart in making decisions and to understand what was the market did.
We can have a return because the market is volatile, whether you are for short term or long term as long as you are having a target which is realistic, you'll surely get some good ROI.
I'd give an example, this year, the dip was $3500 more or less and price of BTC goes as high as $14K IIRC, and if you sell that time, that would make you so profitable, and even if you failed to sell and decide to sell now, that's still a profit.