wow dude, i love the name "disguy"
making sonic better just involves, like any character, knowing what you cna do to counter whatever your opponent is doing, or knowing when you need to gtfo.
and also, learning all your tricky skills like the triple hit SD, hyphen smash timing, edge hogging, spring gaurding, spring2ariel chases, moving Fsmash... mastering the timings of all your attacks, and dodges/rolls.
and learning to use all of your moves properly so you dont suicide (dair, >B)
and also! learning all the moves that give you delay,
over all, just master the mechanics of your character, everything from the way they move, to the way they brush their teeth. you have to BE your character, so the controls have to feel fluent, like ur not controlling anythign but urself. THIS AINT NO GAME, THIS IS SMASH! THIS IS LIFE! haha.
become one with sonic, essentially.