Also interesting that many of the not-insta cancelled series post 2010 have been sports manga. Kurogane at 68, Cross Manage at 42, Straighten Up at 86, Mononofu at 43, Robo at 62. These make up 5/9 manga post 2010 that made it past 40 chapters but were cancelled without taking off. They're certainly trying at least.
Besides Cross Manage that is the literal definition of Jump trying too hard to make a flop work (I loved the manga though, so thanks Shueisha!), most of the others were well recieved by the readers.
Kurogane was ranking pretty well until Chapter 34 I think (around Koisome Momiji-Sensei no Bulge-Saiki round). And it also played it out like that in sales: showed some potential in sales (starting from Vol 3 onwards) from a complete newbie mangaka but never broke through.
Sesuji wo Pin to! (though I am reluctant to call a ballroom competitve dancing manga a spokon) Didn't that one end thanks to it's mangaka? It had a great 2015 and 2016 reception wise, besides the short struggling phase of 3 weeks when Takuan no Batsu flopped. 2017 as well, and it ended despite not coming even close to the bottom either.
Mononofu as well as Kurogane for about 30ish chapters until it started crashing down to the bottom.
Robot x Laserbeam....oh boy was this a rocky one. Started well, then Saiyuki and Kamio Yui like crashed to the bottom with Hungry Marie, then pulled itself up (and Vol 2 sales as well) from #34 issue of 2017 onwards and peaked on #40 (being one of the rare who managed to show up before One Piece in the magazine) and #41 (2nd cover), then it started cooling down again but remained a mid-low tier player for the rest of 2017 for Jump, so it could finally become a Bottom 3 in early 2018 and falling to the Bottom 1 when JK-Noah-Ziga round started.
I don't think Jump was wrong to push any of these except for Cross Manage to be honest. It's just that neither of these (except Sesuji? No idea what was about that one) managed to hold the attention of the readers for too long, coupled with stagnating (low) or dropping sales.