My Apple MacBook Pro will not turn on

Hi, I have a 2020 MacBook Pro model A2251. A few months ago it would not turn on, I followed every steps I found online, still nothing. I took it into Apple, and they could not figure it out either. Later that night I just held the power button for 10 seconds over and over again for almost 2 hours and I was able to get it to turn on. It was working perfect until last week. I was working on my computer, I got a 10% battery warning, and I just shut the computer without plugging it in. The next day it would not turn on again. I didn’t mess with it much until the last two days, and it still has not turned on. What could the issue be? I’m so confused because when it first did this, it was working perfect, then it just did not turn back on, and then it worked perfectly fine again.