My philodendron selloum looks sick, I'm a newbie with plants and very worried

hi and thank you for your answer!!

how did you come to this conclusion?? I'm asking because I'm really unaware about plants and I want to avoid doing other mistakes

I actually wrote something in the post as well but forgot that it gets deleted if you post pictures. I was saying that I got it in March and always kept it on top of a locker in my bathroom where it got low/medium light from a darker glass window because it was the environment that most felt like a rainforest in my house, so was it actually a bad decision?

The dark edges started appearing one month ago, I cut off the browned leaves initially but now it spread to these other leaves and the brown parts feel kinda wet/moist. But as you can see there are also new beautiful leaves popping up, is it a good sign?

I now moved it into my room which is where I took the pictures, is that amount of light/airflow better?

/r/philodendron Thread Parent Link - reddit.com