I'll turn into a solid fan if...
Her performance in Captain Marvel blows me away. I love Marvel movies and the current actors.
I have liked Brie's indie drama performances better than her funnier performances so far. She was great in Room(I just wish Jacob had been nominated too-he was just as good, even for best supporting actor.) and I watched the beginning of Short Term 12 but at the time I wasn't in the mood for a drama but I'll finish it soon.
I did not like United States of Tara too much ( and I didn't realize it was Brie for the longest time because she looks different and I didn't watch religiously-only with my mom and I usually read while she watched). More so, I didn't like the character of the daughter because she was pretty slutty for a 15 year old girl and I thought the webcam stuff was pretty weird. I don't remember her part in The Spectacular Now at all (where was it?! I'll rewatch.)
Haven't seen Trainwreck or 21 Jump yet though.