Nowadays many blogs are being created on a daily basis that is not active online due to one thing or the other but the best thing for you to do when you create a blog, and you don't need the blog anymore is to delete the blog. you can easily Gmail your unused blog without leaving the gmail account
Read: - How To Disable Blogger Blog From Public Access
How to delete your blogger blog
Login to your blogger dashboard
Click on settings
Under settings click on Others as shown in the picture below
locate Delete blog
Click on Delete blog
A pop-up box will show up
N.B you can restore your blog back within 90 days before it is permanently deleted by blogger, but you must have downloaded your blog content
Have you read: - Blogger: - How To Backup Your Blog Content
you can as well create another blog with same gmail account
Click on Download blog if you want to download your blog content but to permanently delete the blog
Click on Delete this blog
Kindly read: - Updated-How To Backup And Restore Your Blogger Blog Template
I hope this post helped you