Iphones Ironic pathetic battery life

I got a iPhone 7 in May 2019. I got the phone on contracts with mtn. From May until today January 2020 the battery life of phone deteriorated very quickly. The battery health sits on 90%. I am on the road as well and need to make a lot of calls and see clients. Iphone is really not a business phone. I ended buying a cheap Chinese phone xiaomi for 2000 and it has a much bigger battery and gets the job done of helping me to do my job since the flashy expensive iphone can't handle the job. Don't waiste your money on a iPhone. My wife has a Huawei that's over two years old and she uses that phone heavily and it lasts longer than my iPhone and Huawei will even charge less than Apple to replace her phones battery if she wants to do so. I know phone batteries doesnt last forever but this is a joke and won't pay 500 rand to replace the battery at a istore. I will rather buy a cheap android Xiaomi phone with a much larger battery. Apple is a status symbol and I realized that to late. I challenge Apple to bring any of their phones and see if can outlast my Xiaomi redmi 8a. It's a cheap phone and it's works like a donkey nonstop.