I just completed a successful job search, including landing a great senior level IC role at a large tech company. I do not have LinkedIn (or GitHub etc.).

Based on what I've read and heard from hiring managers, I optimized two things: CV and video call setup. My CV was customized for every application, a single page dense with information but designed to be easy to skim and pattern match to the role requirements. For video calls, I had a high quality camera, microphone, lighting and background arrangement. There are tons of guides for YouTuber setups, which I followed.

I have no control experiment (it could be due to a hot job market or my experience profile) but I was honestly quite surprised how effective it all seemed.