Battery drain one app switcher and closing apps

Please can you help me I cannot fix this I’m trying to close bit live because there are too many ads I’m gonna die because in ship to stop these ads but it needs to pay but I do not have a payment method so I have to close the apps via the app switcher works but I drove my battery when I get out of it what the heck please help, And my battery is draining and it’s giving me a headache, I just took it off charge and not 99% battery power, I got low-power mode, but that doesn’t seem to contain it This only happens in the app switcher, and using Siri or dictation