Thanks for getting back to us, Naruga. It’s appreciated.
About the battery usage on your iPhone, iPad, and iPod touch - Apple Support -- First, get a piece of paper/pen or use one of the apps on your iPhone (such as Notes), and write down the top 5 apps' battery usage for the past 24 hours and past 7 days.
Batteries - Maximizing Performance - Apple -- Then, review the information in this section, and apply the steps provided. Then, use your iPhone as you normally would.
After a few days, check the battery usage again and compare it to the list you created at the beginning. Has it improved?
Please let us know the results when you're able.
All the best.