Migration from Hostgator to Google Hosting by maintaining same montly price, any help?

Hi super developers and system experts, hope you are more than great,
I'd need to organize the best way to migrate all my dozens of domains from this hosting
https://www.hostgator.com/dedicated-server
(the 2TB Power plan exactly)
to Google or another scalable/ready for the future hosting

Problem: I don't wanna "pay as you go" plan for now, but I'd need to pay around 269USD/month included vat, now I'm paying 249USD for a fully managed dedicated on Hostagator.com

Due to the fact if I start double backup retaining each week, multiplied for all about 45 cPanels/domains the space of 2 TB isn't enough.

Some solution?
App: Wordpress, JAVA, PHP, ome blockchain app like Paxful, so many Wordpress websites for my clients and mine

Now I'm paying 249USD per month, I prefer to stay on this pricing range, or just 20 bucks more, fully managed, controlled and continuously resource / disk optimized by experts.

Also, I'd need help for a safe migration of files /databases on another Cpanel hosting bigger than 2 TB, I like Google hosting, but it's not easy like Hostgator, any help for a 100% safe migration and all domains 100% working after the migration?

You can make a warranty about all the websites and app will work 100% after the migration is done?

Please reply [44/45/46/47] in order for me to check you have read without posting an automated offer, thanks SO much

Best regards,
RVP