This can be made more likely, for example, when you are sleep deprived, take alcohol, fevers, miss your Keppra
Try to avoid these precipitating events, try to get enough sleep etc. 2 grams of Keppra
a day is a standard dose, and should hopefully protect against a furhter seizure. If not, then there is room to increase it further, unless you have intoelrable side effects.