IPhone recovered twice, still not working?

Recently my iPhone 7 has been turning on and off, with the apple logo flashing on only to go back to a dark screen. This has happened before, and I had to go through iTunes and restore it in order for it to work. Well I tried to do the same method again, two times, but its doing nothing! What should I do?

It's broke, get a new one.

It's probably broken or you need a new battery. Happened to my 3s several years ago. I can charge it and then when I try to turn it on the logo shows up and then it's back to the black screen. I think it's the battery.

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