How to remove jailbreak from my iPhone?

Try restoring your iPhone as new. Be advised, jailbreak installation

makes unknown changes/alterations to iOS and a restore may not

be possible.

Your favorite search engine may provide some direction.

Terms of Use for this forum prohibit discussion of jailbreak topics.

I would just reinstall the OS via iTunes. If running an older iOS then try updating via the iPhone.

iPhone 6 can’t run any version of iOS higher than 12.5.6

Jailbreaking to get around Google not supporting payments is simply not going to work.

your only option is to buy a newer iPhone .