Hi, maybe you could consider something like this:

Keep 17-50 and 70-200/4 as a good general purpose zoom kit.

The short telephoto primes 85, 100, 135 are a bit redundant, it could be an idea to keep only one of them. I would say the 100 macro (to cover also the macro stuff).

For longer ranges / large apertures it could be a good idea to keep the 200/2.8 and add an extender to it. (I understand you want the 70-200/2.8 II, but it will mainly be used at 200/2.8 so you might as well stick with the much more handy prime.)

When it comes to the 50/1.8 you might as well keep it. It's a good lens (IQ-wise) but you won't get much if you sell it.

So, sell 135, Sigma 85, 100-400 and buy an extender. That would be my suggestion for unlocking some cash while keeping a good lens lineup.