How to Delete 300+ pictures that are not in my current albums...

I see how to delete pictures that are in my current albums...
I have deleted as many as possible to make room for more...
I am down to two small albums...

I am not able to add more at this time as the notice indicates that I have exceeded my limit.

Question Please

How to delete the 320+ pictures that are not in my albums?

I am working from a new MacBook Air.

Can you please help me with an answer?

Or just delete all the pictures that are not in my current albums for me,
so that I may add more.

Thank-You for your time and help...

Kind Regards,
Lindsey Lacey

Reality is that likely many of your total pictures are in your "attachments" file, which I think also encompasses your albums.

Go to your PMs, scroll all the way down column on the left to the very bottom and click on "attachments" and you will a bunch of links.

At the top of the listed links will show your total use of space.

Thank-You for your time and help.
Very much appreciated.
Kind Regards,
Lindsey Lacey