Lana del Rey I think (edit no)
Daft punk for sure I think they only technically have 4 solo albums that aren't live and they've been around what? Almost 30 years?
Neutral milk hotel of course
Jai paul doesn't even have an album
ASAP rocky at 4 projects? (technically 5 but no one remembers deep purple)
Frank ocean
I would say Kendrick and D Angelo
D'Angelo is definitely a Neo-Soul legend. 
And Kendrick Lamar's legend status is already safe, too (even though some KTT's users won‘t accept it)
I thought Kendrick had even more than that too I just didn't wanna call him out.
Dude put in heavy datpiff work prior to OD
People here Def call them legends tho
I always forget deep purple was fan made. I didn't even know until like 2019
Frank Ocean really doesn't have that much to his discography tbh
4 projects I guess but over like 12 years lol
nick drake
Nicki’s got 4 albums & Drake has 5, plus multiple mixtapes each /s