There are many factors that play the role here. Some are obvious and visible and some are hidden and secret. The most visible ones? Have a huge spike in activity, views, comments and favs, higher than your previous days or releases. And have in mind that even that is put against other people's performance, so basically there will be days where even with great gains you won't get trending because many other ppl had them too.
But anyway, that's just the tip of the iceberg. The only thing you can do to "increase the chances" is just post a lot and gather attention.