How to avoid that the World Cup group matches are all Asian teams?

The World Cup group matches will not be all Asian teams. First of all, the group stage is decided by drawing lots. Before the draw, all teams except the host country were divided into different grades according to their strength, and then different teams were selected according to each grade. Asian teams are relatively weak, and it is difficult to be divided into a group. In fact, the whole lottery is based on the principle of avoiding the same continent. There is only one team in the same continent except Europe.