There is no bus from GF to Epcot, so your only Disney transportation option is the Resort Monorail to the TTC, then transfer to the Epcot line. You could also walk to the from GF to TTC via Poly, but that’s a hefty walk and really only recommended if you want a nice long stroll.
If you have a car, you can drive to Epcot.
Alternatively, taxi/uber/lyft/Minnie Van (if eligible) are options as well (these will be the quickest).
Are you staying at GF and/or how are you getting there?