If it's dead, it is dead and nothing short of magic will bring it back to life. 'R.A.F.' is considered a tender or annual fuchsia so unable to winter over unless in very mild, frost-free winter climates. It would have required bringing indoors (or at least somewhere above freezing) for winter protection. Where are you located and when did you plant this fuchsia and what sort of care have you provided?

FWIW, MiracleGro is only a fertilizer, not a magic elixir, and one never fertilizes a plant that is stressed or ailing in some fashion. And it certainly won't have any effect on a dead plant.

What might have killed it? You live in a warm area so it is most likely bacterial or fungal rot brought on by overwatering. No cure.

There's no clue where the OP lives but April is pretty early anywhere in most of North America for tender or hanging basket fuchsias.....unless in a greenhouse. I'd suspect the culprit leading to fatality would be excessive cold from too early planting or unsuccessful winter storage.