most overpowering mixer is probably something like Monster energy drink, cordial or lemon/lime juice.
Another possible option if you're disliking the taste of vodka you've tried is to see if you like a more upmarket brand. So instead of Smirnoff and the like, something like Grey goose or Belvedere.
Otherwise in a similar price change, see if you prefer the taste of something like Zubrowka.
Realistically though since you probably don't want to pay a premium, I'd just mix it with Monster, especially the orange can I tried recently, it was like I was drinking orange sherbet, it could probably mask anything.