Tumblr reached its peak around July to September 2013 and the traffic and its popularity have been decreasing since then. It's a great site for microblogging and to get backlinks - but like other social media channels, it takes time to get popular and receive the engagement you expect.
Tumblr has a built-in affiliate program. However, it doesn't allow people to promote Tumblr on other websites and resources, it only promotes merchants on Tumblr itself. That's why the best and the only alternative to the Tumblr affiliate program is Elfsight.
To earn directly from your posts on Tumblr, use ad networks, such as Google Adsense. products that you don't sell, you can use affiliate programs to offer your visitors different products. program to recommend books on caring for a lawn, or what plants are best for. Tumblr is part blog network and part social network.