That is one thing we all can agree on. Over the last 10years, if you check the bitcoin price chart, this is clearly evident.
Short term ups and down, due to news, hacks, bans and so on will keep nudging the price but in the long term it is always going up.
So stack up on bitcoin as soon as the price hits a low and keep increasing that stash every few months.
No point in doing short term, gains will fluctuate because bitcoin is not a get-rich-quick scheme.
It remains only to find out where the minimum was. )
In fact, it is very difficult to do this, almost impossible, so you need to start buying when you no longer have any doubts that you are in a bear market and start buying in equal parts, or until the budget lasts, or up to a certain level. And then wait for ATH and act at your own discretion.
News can affect the local movement of the Bitcoin price, and most often it does, but this news often becomes available after the main movement has occurred. Globally, you are right, Bitcoin is only growing, for obvious reasons, its supply on the market is shrinking, its emission is limited and I am almost sure that over time there will be more and more people willing to own Bitcoin, which will contribute to its further growth.