Kane needs to take long break, at least year or so, gain some weight, put on some more muscle (he is in great shape now, but he is not "monster" he once was), get some rest, do some exercises to gain speed and strength and come back better than ever before.
I know he will never again be as big as in 2001-2002 but he still can be huge considering his height and age (not like he is Hogans or Flairs age, he is still kinda young).
It pains me to see how he moves so slow (his knees are pretty fucked up it seems), loses to fucking jobbers, and doesn't get any respect from most of fans.
He just needs to get off TV for some time and come back better, more interesting, corporate Kane is old, re-masking him is useless, after they overdid it in past few years, he needs something better, newer, more interesting.
He also needs to go part time once he comes back, nobody wants to see him every week anymore.
He has no credibility now, but he can gain some if writers use their fucking brain, he can be great again.
Even at this age, this year, there is still a lot left to do with Kane character, but those fuckers are lazy.