suggest phone for this sale(budget-13k)

Dimers, kindly help me in suggesting phone. I have bought redmi 9 power 4 128 from redmi store on 31st dec but I was not happy with performance of that phone because of camera, and also sometimes there is voice issue in calling, and battery is not also so good as portrayed by redmi,processing is also slow and lastly due to cb and bank offers of amazon on redmi 9 power, the price has reduced around 2200 rs So I sold this phone today .

My requirement is of good processor(not for gaming, but for apps so that many apps can open simultaneously and does not refresh again and again), and storage is of 128 Gb and battery approx 6k mah. Kindly suggest (I am thinking  this time about poco phones). It will be great help for me. Thanks in advance