Hi @Jennifer Guilbert -- Welcome to the Atlassian Community!
I believe this will do what you ask. Please substitute your project and status names.
project = myProject AND status = myStatus AND NOT status CHANGED AFTER -30d
And, please look here for more information about advanced JQL searching:
Jennifer, I am glad to hear that helped you!
And as an FYI, we use quick filters like this to help our teams using company-managed projects (classic) who have a lot of work in progress (WIP). Checking during the stand-up for things that haven't moved in a while can help start useful discussions. Such as: NOT CHANGED AFTER -3d
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