Help: Dynamic Serving + Cloaking + Backlink Tiers for Casino Landing

Thread Title:
Help: Dynamic Serving + Cloaking + Backlink Tiers for g9kingbest.online Casino Landing Page
Hello everyone,
I am optimizing my online casino landing page:
arduino
Copy
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https://g9kingbest.online/
Target: page 1 Google for keyword “g9king”. Currently:
Dynamic serving via Prerender.io on Cloudflare Worker Googlebot → full HTML, user → SPA.
Content is already 500+ words, FAQ schema, internal links, video reviews, core web vitals okay.
Resubmit URL, re-cache, re-crawl on GSC.
But still stuck on page 2. Please provide insight for:
Safe Cloaking
What is the most reliable UA-detection technique?
How to serve extra content only to Googlebot without triggering manual action?
Backlink Tiers
Ideal tier structure Blogspot PBN tier 1 → tier 2 → tier 3?
Exct-match vs branded vs naked URL anchor ratio?
Cloak & Dynamic Serving Integration
Best HTAccess/Worker rule settings to serve prerender to bots & regular content to users?
Tools & Testing
What tools to check if cloaking is successful & tiered backlinks are safe e.g. bot simulator, undetectable proxy?
Any experiences, script references, or case studies are greatly appreciated.
Thank you – hopefully useful for everyone!