My Lenovo K8 Note won't turn on

So, last night, I accidentally fell asleep on the couch while watching a video on youtube and I woke up and my phone won’t turn on. I thought that maybe its battery has been drained, so I left it charging. Usually, when this happen, after a few minutes, I can already turn on my phone, but now, even a few hours passed. It won’t turn on. Yes, the led light’s up when it is charging but something weird happened. When I remove it when charging, the led still light’s up.

So, I tried the solution here https://lenovomobilesupport.lenovo.com/t...

But it still doesn’t fix it. Desperately need help, this phone is a memento of my late mother.