The final policy size (20539) is greater than the limit (20480)

Question

I have a lambda function, I create triggers for aws lambda functions, I created 54 triggers using rules, I need to create more triggers, but when I add 1 more triggers, I get this error message The final policy size (20539) is bigger than the limit (20480).

How to increase the size of the policy?

Does policy size mean json size?