Upgrade Theme for wordpress website of www.bhagawadgeeta.com

My WordPress site, www.bhagawadgeeta.com, runs smoothly on its current but outdated theme, yet that theme locks the server at an old PHP version. I have already purchased and uploaded “The Gem” from ThemeForest and now need an expert to migrate the site to this modern, PHP 8-ready theme without losing content, SEO structure, or functionality. Here’s what I want to accomplish: • Switch the active theme to The Gem, tune its settings, and verify the whole site works flawlessly on PHP 8. • Design two key pages inside the new theme. Each page should feature sliders and widgets, rich images or video sections, plus clean social-media follow/share areas. • Build a fresh single-post template inside The Gem and programmatically apply it to all 207 existing posts so the old template is retired in one sweep. • Create simple placeholder landing pages for a few top-menu items so I can drop in content later. These pages only need the site header, a hero area, and a well-styled body section ready for Gutenberg blocks. Make sure the navigation sidebars are efficient & clean and the main menu is functional and correct. Deliver the work on a staging copy first, let me review, then push live once everything passes testing (speed, responsiveness, and permalink integrity). I look forward to working with someone who knows WordPress, The Gem, WPBakery/Elementor, and safe theme-switching best practices.