But investing in bitcoin for the long term (not based on a 4 year cycle) is a wise decision as the demand for it will increase over time and in terms of market capitalization, the growth potential is still huge.
Investing basically means long term and if you want something for short term, it is trading or speculating with the market, but surely not investing.
The priority for investing in Bitcoin is for the sake of making profit and also protecting your asset against inflation. So, if I decide to invest into Bitcoin for a decade or four years interval, I will still make profit and I know my capital will not be inflated but would have more value added to it.
Inflation of fiat currencies is their own problems that come from governments and central banks. Bitcoin, fair to say, is inflationary too but it is less inflationary than fiat currencies. Bitcoin has only 21 million bitcoins in total supply, but it's inflationary, however the cap at 21 millions of bitcoin is very good to attract people. It's big difference with fiat currencies that have no caps, very high inflation and no cap.
It must not only be that an investor should invest hold their Bitcoin for interval of four years, depending on what the person wants, they can hold for a longer year,
5 years is recommended by hodl map.
https://hodl.camp/