That's his problem, he was very slow in their first meeting, Haney can predict his game plan so he cannot win if he uses the same strategy. I think he needs to conserve his energy, be a counter puncher and make the right timing, that way if he can hurt Haney, there's a win that he can win by KO.
One good timing to land a solid combination will change the direction of this fight, like what we have seen from their last match Kambosos game plan was well read by Haney, those counter jabs hurt Kambosos a lot so he needs to find ways to counter that plus he needs to make solid conversions, a wise in throwing punches will conserve his energy and might bring him the belt back.
Counter punching strategy will best work against an aggressive opponent, and since Haney is more of a technical fighter than an aggressive fighter, so I would say that the chance Kambosos would land a good counter punch is very slim, he needs to be accurate so that one punch could change everything.
It's easier said than done actually, but a slim chance is better than nothing.