One true morty

Does anyone know the fastest way to level up egg morty he is at level 10 atm

Use either the morty swap method or meseeks box method but I'm unsure whether the level 20 method works outside campaign mode

For OTM (any lvl)I can give you:
Christmas present morty lvl 41
Christmas past morty lvl 41
Christmas future morty lvl 41
if you are interested, write a message here or on instagram sample__txt
Ign: Kacaper00

For OTM (any lvl) or 10eggs
I can give you:
Christmas present morty lvl 41
Christmas past morty lvl 41
Christmas future morty lvl 41
if you are interested, write a message here or on instagram sample__txt