Since I no longer use this I guess it’s ok to share.
Here’s a way to avoid the Google sandbox.
When you buy a new domain, lets call it xyzcasino dot com
You create a subdomain on an established site in good standing with G and call the subdomain xyzcasino.establisheddomain dot com
Place a page on the subdomain with quality content, title, description, keywords, the works. Get some links going to it so G can index it.
Build your new site and make sure you use a noindex/nofollow meta tag while you’re building it.
Once Google has indexed the subdomain on the established site and your new domain is fully built out do a 301 redirect from the stablished site subdomain to the newly registered domain and voila you avoid the google sandbox.
Tip: take your time, it may take a while for Google to index the pages. Give yourself a timeframe of about a month or more. Also, make sure to leave the 301 redirect up for over 180 days.