Homepage Load Speed Boost

My homepage takes noticeably long to appear for visitors, even before images start rendering. I have already run several speed-test reports (Google Lighthouse and GTmetrix) and will share the full results file as soon as we begin so you can see the waterfall and recommendations firsthand... (Budget: £10 - £300 GBP, Jobs: Google Analytics, JavaScript, Performance Tuning, PHP, Web Development, Web Testing, Website Optimization, Website Testing)