you're definitely hitting the core pillars there, but the thing is, if i had to pick the single most important piece, it's probably content that actually solves problems. everything else kind of flows from that.
here's how i see the hierarchy:
content quality sits at the top - if your content sucks, nothing else really matters. google's gotten scary good at detecting thin, keyword-stuffed garbage.
technical seo is the foundation - site speed, mobile responsiveness, proper indexing. you can have amazing content but if google can't crawl it or users bounce because it loads slow, you're dead in the water.
keyword research bridges the gap between what you want to write about and what people actually search for. most people skip this step and wonder why their brilliant content gets zero traffic.
backlinks are still huge for authority, but they're more of a result of good content than something you can force. build something worth linking to and the links follow.
the part most people miss is user experience signals - dwell time, click-through rates, bounce rates. google's watching how people interact with your site after they click through from search results.
but honestly, if you nail content that genuinely helps people and get the technical basics right, you're ahead of 80% of websites out there. the rest is optimization.
what type of site are you working on?