Is my cellphone broken for good?

I dropped my phone at night about a week ago and couldn't find I until the next morning. The stickers inside said there was no water damage but when I opened the back there was water in it. I put it in rice for 2 days and it worked fine for 3 days except the "up" volume button on the side didn't work but I can just do that through settings. Today I dropped it on the ground (which I've done a million times) and I put the battery back in and it didn't turn on. When I plug it in to charge the first screen when turning it on just blinks on and off. What happened to it? Is the battery fried? I kinda want to get a new phone anyway.