The most important thing in boycotts is not giving them (more) money, and not promoting their goods/services. You can’t get your money back from already bought things, so you can use or buy used stuff from other person.

Regarding Minecraft, the most effective is to avoid all its subscriptions and new purchases. But there are more actions, like not promoting and not playing. It is more about what you can do at the moment. Usually, listening and sharing the bad things done by the company helps you decide what can you do rn.