Rune Knight's storm rune seems to fit the bill pretty well. It takes your reaction, but it can give advantage - or disadvantage - on basically any roll within 60 ft. Comes back on a short rest too.

Kobold rune knight 7 wolf totem barb 3. Not saying that's the best option, but that looks pretty dang good. Lots of ways to provide advantage.

Personally, I'd probably look for a different race...kobold's small size is slightly annoying. The newest hobgoblin has a lot going for it in terms of "buffer" abilities, and they're medium size.