The Skyliner isn’t going to the front of Epcot where your car is . It goes to international gateway. Not sure if there is a bus that goes to Epcot from HS. You might just want to move your car to HS.
I’ll ask what everyone is thinking- why will you be able to move your car at night but be unable to do so during the afternoon?
If Disney can’t get you to the EP parking lot you can rideshare there (that would be my vote anyway considering the slog it is to walk through EP from IG to the front).
By the time Fantasmic runs Epcot will be closed and if you take any kind of Disney transportation back to Epcot you still will not be able to get to your car as all transportation from DHS to Epcot will take you to Internatiinal Gateway at the back of the park. Your car will be at the front of the park.
If you don’t move your car you will need to hire private transportation to get you to your car at Epcot.
Either park at HS in the morning and skyway over to Epcot, or park at Epcot in the morning and uber/lyft back after HS closes.
While I believe buses run for up to 2 hours after a park closes, I wouldn't trust my chances on getting back to Epcot (and you'd have to go from HS to Disney Springs and then from the Springs to Epcot, IF they are running the buses there).
This is always our plan when we park hop. Park at our end of the night park & use Disney transportation to get to park 1. Exception being our AK to DHS day. We will drive to each.