Joining the church as a priest or nun is a good start, but not required. The Vatican works hard to identify laypeople who are candidates for sainthood. Think big! Some saints are honoured for extraordinary service to a small group of people or the local community, but your exemplary life is more likely to be recognized if you have a bigger, more globally noticeable impact.
You don’t technically have to perform these miracles while alive—you could intercede from Heaven to make your miracles happen instead. However, it isn’t as guaranteed that you will be recognized for the miracles you perform after your death, so it doesn’t hurt to get this requirement out of the way as soon as possible.
If possible, try to be martyred for your faith. This happens less and less these days, but being killed because you refused to renounce your (Catholic) religious beliefs is sure to get you and your sainthood case noticed.
