Idea for a sabbatical, if you can afford it, if you have the contacts and if you can, go work for a company someplace very different to where you are now. I'm thinking about cities like Firenze, Osaka, Seoul, Johannesburg, Rio, Moscow. It may only be for 5-6 weeks but hopefully the change in culture will be a fresh awakening.
I spent 3 years in Japan and I strongly recommend that one should work in places very different to where you grew up.
p.s. I should read the whole editorial. I read the initial part in outlook and then only realised that there was more on reading the later comments. My apologies for this.
As a new suggestion, is there you always said that you wouldn't mind doing, but never got around to?
I'm thinking of something like sculpture, mastering a herb garden, painting in oils or something like this. If you could find a month long course, you would have the time to practise, learn some theory and learn practically.