It really surprises me that there are still people who can't grasp the fact that quantum computers will break current cryptography in Bitcoin in less than ten years.

Don't listen to people who say it's 50/50, a speculation or just some kind of scare tactic, read what cryptographers have to say about it, not some random Joe who only knows what he read on forums or heard on YouTube.
Then you'll understand why quantum-resistant cryptography is already being heavily developed and tested.

Due to Bitcoin's transparent nature, old addresses holding thousands of coins could be easily targeted and taken over by an adversary using quantum computers.

Bitcoin will need to hard-fork and either take action regarding these old addresses or simply leave them to be taken over.

If Bitcoin doesn't hard-fork in time, it's game over.

As for the OP's question, you could send your coins to a newly generated wallet address, such as P2PKH or P2WPKH, which do not publish your public key on the chain.
The public key is only revealed when the coins are spent, giving you protection against certain cryptographic attack vectors.

It really surprises me that there are still people who can't grasp the fact that quantum computers will break current cryptography in Bitcoin in less than ten years.

Don't listen to people who say it's 50/50, a speculation or just some kind of scare tactic, read what cryptographers have to say about it, not some random Joe who only knows what he read on forums or heard on YouTube. Then you'll understand why quantum-resistant cryptography is already being heavily developed and tested.
Then you'll understand why quantum-resistant cryptography is already being heavily developed and tested.

Due to Bitcoin's transparent nature, old addresses holding thousands of coins could be easily targeted and taken over by an adversary using quantum computers.

Bitcoin will need to hard-fork and either take action regarding these old addresses or simply leave them to be taken over.

If Bitcoin doesn't hard-fork in time, it's game over.

It really surprises me that there are still people who can't grasp the fact that quantum computers will break current cryptography in Bitcoin in less than ten years.

Don't listen to people who say it's 50/50 or just some kind of scare tactic, read what cryptographers have to say about it, not some random Joe who only knows what he read on forums or heard on YouTube. Then you'll understand why quantum-resistant cryptography is already being heavily developed and tested.

Due to Bitcoin's transparent nature, old addresses holding thousands of coins could be easily targeted and taken over by an adversary using quantum computers.

Bitcoin will need to hard-fork and either take action regarding these old addresses or simply leave them to be taken over.

If Bitcoin doesn't hard-fork in time, it's game over.