Google is killing me slowly and I need to resort to Reddit

Since the Google algorithm update hit on June 7, the website I'm in charge of lost >30% of organic traffic overnight (most coming from our blog) and hasn't recovered.

Google said "core web vitals" (largest content paint, total blocking time and cumulative layout shift) were now a part of the ranking algorithm. The website was made with Avada, a very bloated Wordpress theme with terrible core web vitals. An "F" score on GTMetrix despite the caching and cloudflare CDN.

So I went to work and made a whole new website with Astra, keeping the same URLs and links and using re-directs on some of the blogs with irregular URLs. The website now has top core web vital marks and an "A" score on GTMetrix. Largest content paint went from ~9seconds to less than 1 sec.

New website went up Thursday night (June 24th) and organic traffic is STILL slowly, but steadily falling. from 1500-1600 weekly users in May to now 900-1000 weekly users. I'm also starting to feel the heat since my boss just cares about numbers and nothing else.

What to do to recover the lost organic volume?