nikhil4 The Leap team are pushing a fix so that the lazy load feature will ignore images that have loading set to eager or fetchpriority set to high, which should resolve your LCP issue for featured images over the coming days 🙂
In terms of the cache hit rate, it can be a little difficult to achieve a great cache hit rate with a lower number of visits as there is less chance users will access a cached version of the site. As long as you don't use other caching then there's nothing else we can do to improve that and it'll naturally just improve as the site grows