How to Improve Core Web Vitals For SEO?

Core Web Vitals still matter but usually more as part of overall user experience rather than a magic ranking boost by themselves

Core Web vitals are officially ranking signals and are more important now. You can improve core web vitals through good server and website optimization. There is not much you can do about shared hosting as ttfb will be high and page loading speed can't be improved after certain extent. However, you can still push it with cache plugins like wp-rocket, lighter themes, and minimal plugins.