In one word switch. To any other brand.

Bro kya tumhare m34 me front camera and bottom of the screen par parllel black line h after update or before, beacuse I am facing this issue since last month.

Try restart your device i am sure it will be fixed

Bro go to battery setting and turn on fast charging if its on then you should use original charger of samsung.

Looks like so long term user of samsung phones.As I can see in your text you have mentioned i have used samsung m30s for for past 7 years.I will recommend you to go with samsung galaxy s24 fe.Beacuse you will get 7 years of os updates in thst phone a...