I'm also at your position a few years ago where I sometimes ask a question here in the forum. I'm still at the learning stage even though I'm into crypto for years already. Take note that even those successful businessmen are still learning continuously and that's for their self-growth.
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?
The rewards of the miners will not reach zero because the last Bitcoin block will be mined in the year 2140 which will be the next generation already. TBH, we don't even know if a thing called Bitcoin right now will be the same at that time or worse, we might see a cryptocurrency better than Bitcoin at that time. Who knows?

It will never reach zero because they will still earn through the transaction fees.
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.
As for the total supply increase, this article that I just searched will explain it all:
LINKIt's a bit technical since coding is involved but to answer your question:
It is possible that Bitcoin's supply could be increased in the future, especially if a lot of network participants agree that changing the supply is a good idea.
But it's most likely that the majority of participants in the network would not want a supply increase, considering that Bitcoin is often considered a scarce store of value.
As for Bitcoin switching to POS, that's the most absurd thing to do. Not Bitcoin please.
I don’t know if my understanding is correct
It's okay to ask questions here through making a thread, but if you want an answer to a question that you can obviously research online then it would be better to do it.
