Before changing anything, measure. Run the page in Lighthouse on a mobile profile and note the Largest Contentful Paint (LCP). Then work through this list.
1. Resize and compress images
Oversized hero images are the most common cause of a slow LCP. Serve WebP or AVIF, set width and height attributes, and lazy-load everything below the fold.
2. Use page caching
A cache plugin or server-level cache turns each page into a static file, so PHP and the database are skipped for most visitors.
3. Remove plugins you do not use
Every active plugin can add scripts and queries. Delete, do not just deactivate, anything that is not needed.
4. Load fewer fonts
Two font families with two weights each is plenty. Use font-display: swap so text shows immediately.
5. Defer non-critical JavaScript
Chat widgets and trackers can wait until after the page is usable.
6. Use a CDN
Serving static files from a location near the visitor cuts latency, especially for international traffic.
7. Keep PHP and WordPress current
Recent PHP versions run noticeably faster than older ones, and updates close security holes.
Measure again after each change so you know which one helped.