I can't enter my page , it gives an error, wants me to try again later .
Solved! Go to Solution.
What page? Can you otherwise navigate thru your instance? Screenshot? Can you try different browser?
It seems you are setting up a new instance maybe? If so and it has been more than an hour or two then contact Atlassian Support.
Usually, you should not see this error, but as @Jack Brickey suggested contact support.
Is it a Jira cloud you are using or a Data center/server?
You are in charge of your application deployment then, so you should contact your resources if they have set up the Jira application with the correct setup.
General info for data center installation:
https://confluence.atlassian.com/adminjiraserver/installing-jira-data-center-938846870.html