What do white SEO services do that I can't?

I have not fully understood what white SEO services do that I myself can't do.
What do they do? They seem a lot more expensive than black services and less efficient due to the white nature of their work. But what is it that they do, and can anybody else do it themselves sparing themselves the cost of paying for these services?

White hat SEO services focus on attracting backlinks as well as reaching out to high authority niche relevant sources.

Depending on your niche, this can take a very long time.

The time factor and effort as well as greater uncertainty largely explain why white hat SEO tends to be more expensive.

Technically anyone can do it. However, it takes a substantial amount of time with a low success rate. Sellers often have established relationships with contributors / editors.

White hat methods focus on creating organic traffic through tested strategies that are google best practices and white hat methods typically take longer to see results and require more work on the front end.while the results from black hat methods can be more immediate.