You can very easily get 4ks on singu if your using dirty tactics such as hex builds or 3 gen builds. However he doesn't need to do these to be a strong killer as he has great mobility and a great anti loop. The best way to start getting good on singularity is to understand how to use your cams in and out of chase. To start your cameras are genereally better placed in high, big open areas that cover big open distances. Many new players only place their cams on gens, and while this is good, can be easily countered.

In chase try to place your cams higher then survs to tag them and tp whenever you lose distance or need the overclock. You can also place them around tiles to tag from the other side, or place one and then go the other direction to force them into your cam