You’ll need to crack this Advanced Caesar Cipher to crack the code at Stage 4.
My gmail gives a clue as to the pattern. It’s on the home page.
Good luck!
G S F I W C V I
Q R I H S V V L I
V A S H S V C R H
V L V G I J Q V M P
J S W V J Q V M V
J M X I J Q V S P
W I X I R H S V K W
R K R I H S V DI
X J I O G C M U F I C Y X A
Stage 4
JCC CODE