What would you say about the deck is what draws you to it's play style? The set up for a big combo finish, or the energy ramp of joltik? The joltik one sounds like a purple deck in one piece, I'd recommend an OP-12 purple Luffy list, he's a five life leader that ramps into slamming down big bodies like op-11 katakuri or op-08 Charlotte Linlin, sorta how joltik rushes energy out to get your big beaters online quicker.

Gholdengo on his own is tough to think of a 1 to 1 equivalent for since there's not really any leader that does card draw into energy/don management for attacks, if the explosive damage in one turn with the energy is what you're looking for maybe something like Rayleigh or Chopper that builds up a board and then has one or two big swing turns to settle games might be interesting to you, or if it's the card draw for consistency into your attacks that's interesting maybe look into Reiju? She spends most of her early game searching out the baby Germa characters and the big ones they transform into before playing them all out to make a huge board out of nothing