100% agree with you on this. However there is something very unique with bitcoin's 4 year cycle which has never been seen before. I am not suggesting to blindly follow this cycle and I am just advicing to try to understand it.
In my understanding, there are 2 types of assets - those which generate something (productive assets) like stocks, bonds, agricultural land, real estate etc. and those which do not generate anything (non-productive assets) like gold, bitcoin.
Non-productive assets simply derive their value from demand and supply. Now in case of gold if demand increases, price increases, miners become profitable, they dig up more gold, sell at high prices, supply resumes and equilibrium is maintained.
However in case of bitcoin, there will always be a limited supply (capped at 21 million) and it is getting halved every 4 years. Since it is a new asset, demand is increasing but let's assume it is constant. So what happens after every 4 years, supply gets cut in half, miners are making half of what they were making before, they refuse to sell, price go up, now miners start selling at high prices as they have to cover the costs, early investors start taking profits and price settles somewhere but it never goes below the lows of previous cycle.
Supply is decreasing every 4 years and demand is ever increasing so there is a cycle which is taking bitcoin to the new highs every 4 years. This can change if demand decreases more than the decrease in the supply which may or may not happen.
Supply of bitcoin is guaranteed to decrease but we don't know whether the demand of bitcoin will decrease or not. Even if it decreases then it should decrease more than the decrease in supply for the prices to crash. So going by risk/reward concept, the odds are highly in favor of investing in bitcoin (at least as for now).
This is just my understanding and I am not encouraging anyone to invest in bitcoin based on this.
Now the altcoin market cycle is a totally different concept but it is very closely related to bitcoin as of now.