I will admit it has been super huge challenge to gain the good ranking of the core web vitals. I've been pulling out stuff left and right ditch excess graphics, functions, etc. Slowly gaining a bit of ground and Google showed that I just only needed a bit more improvement. Couple days later Google now took all the dekstop pages and marked them as poor again. Really tough to make a perfect score even close being my biggest problem is Google Adsense and the CLS problem. Then one day I could have wonderful timing now its telling me LCP is now too slow at >2.5 seconds again.