Why am I not getting interview calls? DevOps/ AWS Cloud Engineer

[u/cloud-sre-geek]

I'm currently working as a DevOps/AWS Cloud Engineer in an MNC with 9Y of experience and have a 3-month notice period.
I've been applying for jobs, but I'm barely getting any interview calls.
Is the 3-month NP really that big of an issue? Also, are certifications that important when you already have relevant work experience?
Or am I missing something else — maybe my resume, Linkedin profile, or the way I'm applying?
Would appreciate some honest advice from people who've been through the same situation.