I heard that the reward is halved every 4 years after each halving, so the reward miners will receive will always approach zero. To maintain the Bitcoin network, the price of Bitcoin must keep rising infinitely, which is impossible. Could there be a point where the value of the Bitcoin miners receive is almost zero, and the Bitcoin network collapses due to a lack of miners?
Is it possible that Bitcoin could increase its total supply in the future? But that would certainly cause Bitcoin’s price to drop significantly.
Could Bitcoin switch to PoS like Ethereum? That would also cause Bitcoin’s price to fall.
I don’t know if my understanding is correct
The supply of bitcoin will not go up and bitcoin will not go POS, so those two options are not on the table at all and you can forget about them, what you are forgetting is that the miners are not only getting the block reward but they are also getting the bitcoin each user pay to get their transaction confirmed, so at some point this number will get higher than the block reward and as the price of bitcoin keeps increasing, this will cover the expenses of the miners, in which case the scenario of bitcoin collapsing as miners lack any incentive to mine it will not happen any time soon.