A couple of "dirty tricks" for ganking when you're mid:
1) After you have blue-pilled back to base and your opponent in lane saw you do that, do not come back to lane immediately: tell your jungle to keep the lane for a bit and go straight to a side lane to try and gank. This way - especially in low elos - the opponent solo mid will forget to mention that you are missing.
2) After your mid-lane-opponent blue-pilled back, push the lane and try to gank. When they are buying, most people usually forget to mention the misses.
3) If your top/bot tower is about to go down in the next couple creep pushes, it's usually a good time to gank. The reason is that people go blind when they are about to kill a tower and don't even read chat for misses (yep, been there done that myself too).
4) Sometimes, a psychology-based trick that I do is the following: when my jungle is ganking top, I go gank bot. People usually feel safe when they see a gank happening in the opposite side of the map and do not expect to get ganked at the same time.
These are just some dirty tricks that got me unstuck from the low-elo hell. Everything that people wrote before me is good too.