Is a RODE NT1 Signature good for an untreated room with a foam shield?

I mostly record voice acting but I also want to sing. I currently have a SM57 which is great, but I don't know if it is because I don't know how to properly EQ it, but I always end up with a sound lacking in the high end and not a very full sound on my voice.

I record in my bedroom and there aren't that many reflections , maybe because it is kind of open due to my windows and gaps in the door and ceiling.

I've been thinking in getting a condenser microphone to see if I can get a more full and crispier sound on my recordings but I'm worried about the reflections and ambience noise.

I have an Alctron PF8 to deal with some of the room reflections but I don't know if that would get me enough sound quality for professional voice acting work.

What do you all think ?