Hey there, acsenthil!
Thanks for following up and providing that additional details. First, you mentioned that you keep your iPhone in Low Power Mode. Although this seems a good option, we do want to point out this feature is specifically designed to help when your battery is low and you're not in a position to charge it right away. You can read more about this in article, Use Low Power Mode to save battery life on your iPhone.
Looking over your screenshots, we can see that you've highlighted the section showing Home & Lock Screen as the main charge user during this period. When you see this, it can indicate that during that period you were receiving a lot of notifications, causing your screen to wake up. Does that sound possible? If so, you may want to visit Settings > Notifications and determine if there are any apps you don't need to receive notifications from throughout the day.
Use notifications on your iPhone, iPad, and iPod touch
If you continue to experience issues with the ones suggested in the Maximize Battery Life and Lifespan, you may want to reach out to Apple Support so they can take a deeper look into what's causing the battery to deplete faster than expected.
Get Support
Best wishes.