This is my old list of level creators who have made really good courses and super worlds. Its outdated now and I should reaply update it with more current and active users but for anyone playing it is a good start.
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Gotdatmony: 0QH-9NY-PDG
^^^ Dats Me
Some other creators to check out.
Phil32: 4XW-VB1-VXG (full world is incredible)
Hero - CD4-1T7-PWG (full world is incredible, easy difficulty)
KingBooBro - 6DM-DC9-QTF
Iggy2602 - 2TQ-2TC-FWG
abizboah - DLJ-NNF-8JG
GokouD - 29V-SMD-4JF
Megastryker - 61W-T6D-WDG
Pinktops - JN4-6J7-N3G (My favourite creator. Plainly this is the best project in the entire game imo)
Jocchan: R9T-L1M-94G
Buflen: MMF-HSW-TBG (higher difficulty, last level is incredible)
Matilder: 485-X4Q-KXG
QuixoticN: KD8-8WM-9MG (God tier concept designer)
Pesca: VMF-6T8-Q1H
Nocturnowl: 8SJ-DFC-WMG (full world is incredible)
Simbabbad: V0V-RQV-S4G
Ragingbegl: GFF-4D0-8RF
DivideBy0: 5J7-TRL-VKF
IceMarker: 82Y-DCM-1SF
Wijuci: 4DH-X8R-62G
TehLobster: QM6-G34-CXF
J-Spot: 4XR-JB1-PGF
GreenMamba: 008-11G-01G
Steve618: XD9-S6K-13G