It is an intrinsic event of the design of the supply and demand of bitcoin that makes that supply decrease. Since there are fewer bitcoins produced in the same unit of time, each bitcoin is worth more. That's the theory at least, and that coupled with the FOMO ('Fear Of Missing Out') effect has led to further growth in the value of each bitcoin. The same thing happened in 2012 and 2016. The bitcoin miners are competing to validate the next block of transactions on the bitcoin network. To do this, they must solve a complex mathematical problem that is computed on powerful mining machines specifically designed for this purpose, which, by the way, consume quite a bit of energy. these events have led to similar situations in recent years: the bitcoin value has risen sharply in the following months and then fallen (not as much as it had risen) before that bitcoin halving is produced again.