Mobile Speed Score Improvement

The website https://hiland.in/hilandgreens/ requires mobile speed optimization as per the Google PageSpeed Inside. This site is built on HTML. The present speed score for mobile page is approx 26 and for desktop this is 74. However on GTmatix the grade is A. Further, the landing page is having 2/10 as Mobile Speed Test on Google Ads with 100% Mobile friendly clicks. You are not allowed to compress images to look like pixelated and cannot remove the CRM API, Google Tag Manger & FB pixels from the page. The min. mobile test score required must be 70 and above on Google PageSpeed Insights for all pages and min 7/10 on Google Ads for landing page. You need to work only on the pages available inside the folder "hilandgreens". There are 5 unique static pages.