1) Need to pass TRAI-approved template id when SMS is sent to the customer.
2) Website slow speed, need to explore Cloudflare CDN
3) Secure URL (Hide .html extension)
4) Header menu overlapping or showing in double line in low-resolution screen. (e.g. 1366*768)
5) Image Alt tags not mentioned
6) Code minification not used, long js and CSS should be minified for better results.