There are no legitimate strategies or systems that can magically ensure your chances of winning in Keno as it is purely a game of luck.
That said, when selecting your numbers bear in mind that the more numbers you pick, the higher your chance of winning so always select the maximum of 10 numbers when playing the game.
Also, when presented with playing live versions of the game or video keno at an online casino like Royal Vegas, rather play the digital version as this generally offers a lower house edge.