There are a variety of strategies for playing keno. None of them provide you with any advantage, but they can be fun to play. Some of them can also be mighty expensive.
As with roulette you can "chase the old man", meaning play those numbers that seem to be coming up more often than the others. The theory is that they will keep coming up again in the future. The reality is they don't come up any more than chance dictates.

Or you can "let the old man chase you", meaning play numbers that haven't come up in recent games, on the theory that they'll start coming up in order to make the long-run results for each number even out. Again, the reality is that the balls have no memory. Number 47 may not have come up in the last 10 games, but that has no predictive value. In such a case the molecules that make up ball number 47 do not strain themselves to "even the score".

While not exactly a strategy, some players may find it entertaining to play somebody else's losing ticket. If the guy next to you gets up to leave, take his losing ticket to the dealer and say "Play it again". This takes a certain amount of timing and judgement, but can be fun if pulled off well.