I bought the new 24-70 two times....the first time i used it and said to myself....hell this lens is boring. So i sold it. Than i bought it a second time to give it another try. What should i say...it was still boring. I mean...this Lens is sharp like a knife...but for me it has a boring look. So i sold it again. I rarly use Zoom-lenses and the 24-70 has not enough reach...so i bought the 24-105. this Lens is also boring but has a better Zoom range.
Maybe every lens bores you! Or maybe just zoom lenses.
In the latter case may I suggest a therapy cocktail consisting of some of the following lenses:
14L II, 17TSE, 24TSE II, 35 1.4L, 85 1.2L II, 135L
If your boredom is still not cured I suggest a last step: a 500mm f/4L IS II.
Now if even then you feel bored then the solution is to pick ... another hobby
P.S Make sure you use the lenses twice a day (Use before or after breakfast/lunch/dinner is irrelevant)