You'll need a professional audit of your website and fix the CWV issues (Core Web VItals) and fixing of said issues along with optimization.
From what I can see in the screenshot, the first one is CLS.
CLS stands for Cumulative Layout Shift. How much of your page shifts for ads, images etc. to load. Please note, that CWV measures CLS in the continuous process as a user interacts with the site and not just once when a fresh page loads.
To fix this, we'll have to see ads etc. being loaded and how they're shifting your DOM and elements. A simple way to mitigate this is to create a div and declare a min-width/min-height for the div and have the ad inside it.
Basically, what you want to do is leave enough gap for all elements, that show up even before the said element loads.
Additionally, if you're using lazyload on the site, please ensure anything above the fold is excluded from it.
The second is LCP or Large Contentful Pain. This is the part where the main area (block of text or image on your website loads). You'll have serve an optimized version of the same and ensure no render-blocking JS etc. is loaded.
Basically, your website needs to be optimized.
Finally, don't expect overnight fixes. Even if the website is optimized tonight, the data in Core Web Vitals is the 75th percentile of the past 28 days. So it will take some time before the above numbers are stabilized. (Source - Here's an FAQ from a Google Employee -
https://support.google.com/webmaste...page-experience-faqs-updated-march-2021?hl=en)
