Is there a middle way between working towards personal liberation and liberation for all sentient beings?

I may be a little off-mark here, but if I understand correctly there are two broad opinions on liberation. The first where a practitioner works towards her own liberation (the way of the Sravaka or Pratyek-Buddha) and the second where they work towards the liberation of all sentient being (the way of the Boddhisattva). Is there a middle way between these two? Perhaps surrendering a specific desire and to work towards removing one's defilements and allow liberation to come when it does and as many sentient beings be helped as possible.