Mac Outlook too many rules

[anksta]

Hi, I have a bunch of rules at work to sort all my emails into relevant folders but now I can't add any more as it says there are too many and to 'try deleting some rules first'

So I go into the rules dialogue box, pick a bunch I don't need or even just one, click the minus sign and then back to Show All in settings and I get the exact same message as if I was trying to add a rule:

Rules could not be saved because there are too many rules.

Delete existing rules, and then try to save the new rules again.

Anyone else have this issue? Is there another way to delete them?

I'm following the instructions here to the letter: https://support.office.com/en-nz/article/Edit-a-rule-616e452d-9c8d-49a5-8a4e-04437d242acd

Any help?

Thanks