PHP Website Design Makeover

I built my site ( https://tinyurl.com/bddnsbra ) on PHP and now want to freshen up its look. The codebase itself works fine, so your focus will be purely on design: a cleaner page layout and a more cohesive colour palette that feels modern and consistent across desktop and mobile... (Budget: $8 - $15 USD, Jobs: Bootstrap, CSS, HTML, PHP, UI / User Interface, UX / User Experience, Web Design, Website Design)