No credit card required
Browse credit cards from a variety of issuers to see if there's a better card for you.
My immediate thought is that something DID change.
Did you have a balance on one of your cards last time you pulled your score?
If you did, and you've since paid the debt to ZERO, that will actually LOWER your FICO score...
OP, how did you find out about the CL increase? Did you get the score from the same service as the one that provided the alert to the CLI?
SW doesn't alert you to CLIs. That's why I asked. Disputing accounts can lower your FICO in some scenarios.