In all honesty, marrying a US citizen is by far the easiest way to get a green card.
As far as occupations go, there’s a few that have an easier time getting an employment-based green card than the rest. They include:
- Primary care physicians, who can self-petition for a green card via national interest waiver. (You don’t even need an American medical education. You could go to medical school in your own country.)
- College professors. Universities routinely sponsor their faculty for H-1Bs and (later) green cards, although that path would involve many years of education and sweat.
- Religious ministers can get an employment-based green card without having to prove that there’s no American to do the job, as long as they have a job offer from a religious organization in the US
- A small number of other people get special immigration privileges, though the categories are so restrictive that you’re unlikely qualify: https://www.uscis.gov/green-card/green-card-through-job/green-card-through-special-categories-jobs
Are they closely enough related to you to be able to sponsor you for a family-based green card? Maybe distant enough that they can marry you? Or do they happen to run a company with a particular need for workers fitting your description that they are unable to fill with American workers?