We rely too much on Kun and don't have enough goals around the rest of the team.
Look at teams who've won titles over the years - Yaya, Pires, Lampard, Scholes have all chipped in 20+ goals from midfield in title winning seasons; City and United have both had teams who've won titles with four strikers in the squad all chipping in well with goals (Kun, Tevez, Dzeko, Balotelli; Kun, Negredo, Dzeko, Jovetic; Cole, York, Solskjaer, Sheringham)...
In the last few years the regulars in our team other than Kun don't score nearly enough goals. We don't shoot from outside the box enough neither.
Gabriel Jesus will help towards making this better, obviously.