I'm interpreting your question as increasing the domain authority of your website so people can pay you money to publish their guest posts.
I hope I understood your question correctly.
If that is the case, then the best and cheapest way to pull this off is to guest post at other related sites.
The idea is to offer to create content that they themselves are interested in.
And if you get enough of these, you will boost the domain authority of your site, and you will be able to charge more money for guest posts that you publish.
Is this going to be easy?
It's going to take quite a bit of effort.
Is this going to happen quickly?
Of course not!
But if you are looking to build a solid asset, I suggest that you use real guest posting outreach.
If you try to cut corners or you just buy crappy links, you might not have much of a website to offer.
Remember, people are only going to be interested in paying you for publishing guest posts on your site if your SEO metrics are solid.
It's hard to do that using shortcuts.