Ok, so an easy one to get rid of is Humble Choice - the main reason I started getting it was that it helped me to spend less money on games impulsively. But now that I don't play video games very much anymore, I don't really need to be getting 3 games a month.
(also, the useful thing about humble Choice is that I can just pause it, rather than abandon it entirely, so if there's a month with games I actually want I can resume the subscription)