Many people, I’ve noticed, are unable to access customs.
Some of them are ChatGPT Plus subscribers, and some are enterprise users, but they are still not able to get access.
Because OpenAI is not given access to all users, there are only some people who get access to GPTs.
But don’t worry; OpenAI will continue rolling out and giving access to all users. It will take some time, but in due time, you will get access.
Note
Only subscribers and enterprise users can use GPTs, but to create custom GPTs, it also takes some money.
There is no other way to get access to GPTs faster, and you can’t apply anywhere and get an answer quickly.
Just wait for some time 
, and you will get access.