You can join as a marketing partner, advertising online from advertising media companies. They can pay by bitcoin. You need the effort and patience to do any online job. It is the minimum requirement to be able to earn money or bitcoin.
You can refer to a company that I know. they pay by bitcoin.https://www.adworkmedia.com/
However, in my opinion the bounty campaign is the best way for you to earn bitcoin by the effort and invest time to complete it.