I don't think there's any reason to be worried about the future of Bitcoin.  Some countries have legalized Bitcoin, and some are even planning to legalize it.  No one can imagine how high the price of Bitcoin will be when it becomes legal tender all over the world.  So my advice would be to invest more in Bitcoin without worrying about the future.  It will not empty your hands.

some countries may ban BTC but there are also some countries that accept BTC as a means of payment. In the past, there were several countries that banned cryptocurrencies, but until now BTC is still valuable, this means that BTC cannot be destroyed. I am sure that in the future BTC can be accepted by all countries as a medium of exchange and means of payment.

BTC relies on the free market and that principle can and will never be undermined.

If someone thinks it can happen, point them to the prohibition era. The time when the US government tried to stop people from drinking alcohol but since so many people wanted to do it it was impossible to stop them.

We just have to hope that people will like to use BTC and stand behind it. As long as they do it will be impossible to stop but when it becomes abandoned by its users the government won't have to do anything. BTC will die on its own.

In some countries they have already made the decision, and they have no plans to ban Bitcoin, rather they would be regulating it. But for those countries that would decide to ban Bitcoin later, they won’t be able to ban it directly, what they will be doing is to ban centralized exchanges so that people won’t be able to buy and sell; Decentralized exchanges will continue to function in these countries though, and those who understands how they work will continue to be making use of them despite that Bitcoin has been banned.

As for countries that will be into regulating cryptocurrency, you should also know that they will be regulating centralized exchanges only.