As a character, Venti isn’t strictly bad. His main issue is that he’s too content dependent—he’s great against AoE mobbing content or low AoE with groupable enemies and…not so great elsewhere.
(Admittedly, even in AoE he isn’t strictly the best, but in those cases he becomes significantly better)

So…why not change his kit from focusing on AoE content to AoE characters (specifically focusing on quadratic scaling) instead? Hence, the ideas of “decoys” in his Burst: 
- Can be targeted by things like Ganyu or Beidou’s Burst (targeted only if there aren’t enough real opponents)
- Can be affected by elements (and reacted off of)
- Can be marked by things like Childe’s Riptide
- Taunts enemies to help even in non-groupable situations
- Doesn’t consume buffs with trigger counts, like Yun Jin’s, when hit


TL;DR
- C1 (extra arrows) in base kit. 
- Skill creates a platform (1)
- A1 (upcurrent on Hold Skill) in base Skill
- Burst creates a decoy (2), (3)
- A1 creates an additional decoy if in ST
- C1 EM scaling (4)
- C2 Additive Base DMG buff5, decoy damage buff6
- Base C4 (DMG%) weakened, additionally has old C6 effect + Physical shred
- C6 double spawns decoys, increases Crit


Notes: 
1. Enemies will pass through the platform. Characters will pass through the platform from the side or from underneath, but it’ll be solid if they interact with it from above. The platform itself is slightly larger than the area of the Burst and isn’t very high off the ground—just high enough so melee characters can hit enemies in the Burst.
2. See above list
3. Damage from a single decoy isn’t that good.
4. The values would be different for different attacks, but I don’t know nearly enough to give estimates on that.
5. Decent buff but not particularly strong. Better in AoE.
6. Very large increase in base scaling.

What do you think—do you like the direction I took with this?

Venti Rework Concept