Hi Jamie, how are you?
To delete projects on JIRA you'll have to do it manually, one by one.
There's no "Select All" checkbox to delete several projects.
The workaround, in case you have so many projects, it is to drop your JIRA db and recreate it.
There's also a second option, which you can delete all your issues from a project.
On Issues TAB select "Search for issues", click on "Tools" on the right corner and bulk them. After that, select all the issues, click on"Next" button and select the "Delete Issues" option.
Also, if you're a JIRA Cloud user and none of the solutions below are viable according to your request, you can get raise an issue to our support team so we can reset your instance.
Let me know if you need any other information.
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