PLEASE help me my phone is kicking me out of every app

if this isn’t the right place then please tell me a better place to ask if not, but basically everytime i press a app it automatically kicks me out immediately and doesn’t let me go on it and im very confused as this has been happening for 4 hours now and i thought it would resolve and im scared to close the apps i have opened now. the only reason im able to say this is because i was on reddit and had a few apps opened before this started happening and they are still able to work but if i press on any app it doesn’t open. so i had apps opened before this started happening. i’m so confused and im very worried my iphone is not backed up whatsoever

for context i have an iphone 13, ive had it for about 3 years, haven’t updated for 2 years, 100,00+ photos if this is related. my battery has also been draining insanely recently, please if anyone can help this