Caching
Install a caching plugin: WP Rocket (paid, recommended), LiteSpeed Cache (free on LiteSpeed hosts), or W3 Total Cache (free).
Image Optimization
Compress images before uploading with TinyPNG. Keep images under 2000px wide and 500KB.
CDN
Use Cloudflare (free tier) or BunnyCDN for faster global delivery. Your host may include a CDN — check with them first.