Migrate SEO to New Site from old website

I am about to replace the 32-page version of equity360.in with a streamlined 7-page build that is still on the staging server. My single priority is to carry over every bit of SEO equity the current site has earned so that launch day comes with zero ranking or traffic loss... (Budget: ₹1500 - ₹12500 INR, Jobs: Analytics, Google Analytics, Internet Marketing, Link Building, Search Engine Marketing, SEO, Web Development, Website Optimization)