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Do you even play competitively? In what world is electric dominant? There's like 4 electric types that are highly viable in OU in Zapdos, Magnezone, Rotom-Wash and Tapu Koko. And for Magnezone, it has a lot to do with its steel typing.
It is only weak to ground, but it also is one of the type with the least resistances with just 3. Offensively, it only hits super effectively against water and flying types, while being resisted by 4 types (including one immunity). Not to mention that ground type moves are extremely common amongst all Pokémon species (without even counting hidden power - earthquake alone is known by like over 200 species)
Electric is basically a "low risk, low reward" type. There's a reason u-turn is favored over volt switch on Pokémon with access to both. It doesn't need any change.
I mean, you're right but your premise isn't. The reason Electric isn't dominant isn't because Electric is inherently a bad type, they're not dominant because frankly most Electric types suck. They generally either have weird stat spreads, such as very high Speed with the rest of their stats being rather low, or having high offensive stats but without enough Speed to back it up (such as Electivire), or are outclassed by other, more viable Electric types (Raikou and Jolteon, for example, would be better in a metagame without Koko and Mega Manectric overshadowing them. They aren't inherently bad Pokemon, there's just better options that overshadow them in nearly every way) The current metagame is also very hostile to Electric types with Grounds like Landorus-T and Garchomp and bulky Grasses like Ferrothorn and Tapu Bulu being dominant.
That being said, Electric is quite a solid type offensively. Bulky Waters such as Toxapex, Tapu Fini, Suicune, and Mega Gyarados and Flying types such as Celesteela and Tornadus-T are all common and relevant threats that Electric types can heavily pressure. It also has good coverage when paired with Ice or Fire moves (or both, such as in the case of Mega Manectric and Zapdos). It may not have many resistances, but that hardly matters for an offensive type.
Also I don't really wanna nitpick but I'm gonna do it anyways, the reason why Magnezone is viable hardly has anything to do with its Steel typing. Ironically it's because of Magnezone's ability to trap opposing Steel types such as Ferrothorn, Scizor, and Celesteela, removing them and paving the way for a teammate to sweep. If a better Magnet Pull user came along, Magnezone would severely drop in viability (even now, Scarf Alolan Golem has seen occasional use in OU as a means of trapping certain steels, including Heatran, which Magnezone can't effectively beat without gimping its ability to hit Ferrothorn and Scizor). Also, the reason why U-Turn is sometimes (not always) favored over Volt Switch is because it's almost exclusively used for pivoting anyways, and nothing is immune to U-Turn, compared to Ground types, Volt Absorb/Lightingrod users, etc. being immune to Volt Switch, meaning U-Turn is just a more consistent pivoting move that's harder to punish. Lastly Ground moves may be common, but again Electric is clearly a more offensively oriented type, and a massive Ground weakness hasn't stopped Heatran from being one of if not the best Pokemon in the modern OU metagame.