The fine folks who run Comic-Con International in San Diego have put up a page explaining all about Open Registration for next year's con. Open Registration takes place the morning of Saturday, November 5 and the convention itself is July 20-23 of 2023 with a Preview Night on July 19th. If you wish to attend, make sure you have a Member I.D. and make sure you read the page in advance.
No, not everyone will get the memberships they seek. There's a limit to how many people can fit into that convention center and there are a lot more people who would like to be in there for the con. This is one of those sad facts of life.
If you can't get into the con or can't wait for it, remember there is WonderCon Anaheim, which runs from March 24 to March 26 at the Anaheim Convention Center. Some call this "Comic-Con Lite," as it is run by the same skilled organization…and it isn't that "Lite." There's plenty to see, plenty to do. One friend of mine once said, "When I go to Comic-Con in San Diego, I only get to experience a very small fraction of what's there. WonderCon is way bigger than that fraction."
WonderCon is also a lot easier to get into. You'll be able to purchase badges for it very soon. [NOTE: When I first posted this message a few hours ago, I said they were already on sale. They aren't. I got confused between part of the website that's been updated for 2023 and part that is still about the WonderCon earlier this year. Sorry.]