Friend, I honestly do not understand this point, but let me explain why we are here and I hope I am not wrong, Bitcoin will never cease to exist, it will always be present... why? Well, basically the BTC is limited to 21 million, and this feature makes it unique and valuable. As people continue to mine new bitcoins, they are added to the total supply, but there will come a time in the future when that 21 million limit is reached and no more will be created at this point. However, this does not mean that bitcoins will disappear or as you say "if there are no more Bitcoins". Existing bitcoins will continue to be available for use and transaction. Also, because a bitcoin is divisible into many smaller units called satoshis, there will always be enough to carry out smaller value transactions.

Here I leave a source so you can investigate a little more:: https://www.blockchain-council.org/cryptocurrency/how-many-bitcoins-are-left/#:~:text=As%20we%20already%20know%2C%20one,bitcoins%20have%20already%20been%20mined.

Now in that case, and we all end up being wrong and you end up being right, one day suddenly Booom "the Bitcoins disappeared", I would recommend having a well thought out backup plan to make sure that your assets are protected. For example, you could choose to use hardware wallets.