Rattling Noise & Clicky Home Button.

Hello.

I’ve recently problems with my iPhone 7 Plus.

I’ve had my phone for a little over a year now and just recently my home button has been making this really loud and obnoxious clicking noise, I’ve also been experiencing yet another obnoxiously loud sound, my ringer. I’ve had to turn my vibrations off because of it. Another thing, when I shake my phone, a rattling noise comes from it. I’ve tried looking it up and they say the rattling noise is because my battery is becoming loose. Please tell me how to fix my phone.