While trying to add a new project in Firebase, it's showing the warning as:
You've reached the project limit for your account.
You can add Firebase to an existing project or request an increased limit.
Request an increase // button
Later I checked in Google Developer Console and deleted all existing projects in there. Still this issue persists and I am not able to create a new project in Firebase. Any help is appreciated.
While this is likely answered on the Firebase maximum projects and apps question, the most important parts are from Frank van Puffelen's (a Firebase engineer) comments on the Cannot create new project in Firebase console question:
The projects are pending deletion. It takes a week before they actually are permanently deleted.
There's no limit on the number of projects in general, but there is a limit on the number of projects on an unpaid plan. The exact limit for that varies, from what I understand.
Furthermore, the Cloud Platform Console Help section explains why these limits are in place:
Why are there limits to how many projects I can create?
Quotas protect the Google Cloud Community from unforeseen spikes in usage. However, as your usage of Google Cloud Platform increases, you can request an increase in your quota.