In my opinion (a guy with very little valid opinions), the next step for affiliate marketers is to stop marketing other peoples products...
Can I ask what you do in affiliates?;
If advertising to landing pages, you could offer services as an advertiser showing your proof of earnings as a reference.
If it's advertising to landing pages, you could market your platforms to affiliate marketers you've met along the way.
I'm assuming you're really looking for passive income... V. easy to template a website and a business plan. Just now you're your own affiliate, taking all of the earnings.
Now this is something you can scale, if you've got your own website built out - that's essentially marketing a downloadable product.
If you've got a functioning marketing plan, that's a document with value.
And if you do well, there are people that would pay for you to upload and edit stuff you're all that familiar with...
OR YOU COULD TRY DROP-SHIPPING, jokes jokes. I hope this is what you want to hear, as I'm known to often not be on topic.