I'm sure I've spent like, 0.1% of my time on Granblue in Training Mode and I've won tournaments💀. Legit just play the game and have fun and you'll improve. Anyone who's played fighting games knows grinding combos all day won't help you at all lol.
The difference is, in every other game genre you can learn the game by playing the actual game, with friends even (imagine that!), not sitting alone in the lab for dozens of hours to commit combos to muscle memory so that you have even the slightest chance of not instantly losing