I root my device and flash some little modules to improve performance, those are MemeUI Enhancer and Spanish Gem, and for bypass the cts i use the safetynet module, i recommend you rooting with magisk, there are tutorials for flashing magisk specifically for this device, my battery lasts the entire day without any kind of high temperature, and a little note, apps like Trackbook (FB) or Instashit (IG) will consume battery excessively and drain your battery.