In general, you can’t.
You could work for a company that open sources your work. You can consult. A very few people can make enough to live off from donations or support contracts.
But … ultimately I think it’s the wrong approach. Open Source isn’t a business, it’s a community commons. You contribute to the commons and use what others have contributed. Making it about money just means it’s now about the money, not doing something you enjoy as a member of a community.