The simple response is that he isn't.
His stock was, arguably, at its lowest ebb earlier this year. He's had his worst ever positions in the singles and albums charts, and this followed on from widespread condemnation for his 'subspecies' comments about the Chinese last year which, this time, he didn't even try to defend (unlike the NME stitch-up).
I expect he was pretty nervous about announcing a new tour. So, instead of the usual UK tour where he would play to around 40,000 people, he announced a mini-tour of very small venues with a total capacity of about 5,000 people. This guaranteed that the tour would sell out, and that there would be a buzz.
He (or his manager) somewhat disingenuously announced that these would be his only UK dates for this year.
Once they sold out rapidly, he added some more. Having played an absolute blinder to a decent size crowd at Hop Farm, he now has the confidence to play some proper London shows - just two dates announced so far but he would normally sell out twice this number of seats in London.
So, basically, he announced a tiny tour, and by adding these London dates (and any more to come), he's just building it up to a size approaching his usual UK tours, so it's not really a case of being 'so active' at all.