Seamlessly switch existing domain to Github Pages

[anmiles]

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Hi all,
I have my own domain that is already used to access GitLab pages and I'm going to switch it to Github pages.
I have to change the DNS records and then check the custom domain in settings.
But DNS records can take a significant amount of time to be propagated, and some visitors may experience lengthy outages if they get the domain resolved into the new IP while Github still have it resolved to the old IP and cannot check the domain on its end.

Are there any options to reduce this gap and make the whole process as seamless as possible?
I've reduced the TTL to 300 seconds and plan to change the DNS record in 2 days. Is this the only thing I can do?

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