I believe the unskilled job route is the easiest way. And you don't need an agent. You can do by yourself.

Here's the List of USA and Canadian companies that sponsor work visa https://flutterwave.com/ store/sva

Note: close the gap after the "com/"

Look for companies interested in hiring people like you. Then, apply for job. Once you have a job offer letter, your visa is assured.

Note that for the US H1B visa jobs and J1 visa jobs, you'll need a minimum of a bachelor's degree or it's equivalence.

Finally, whether you want to travel as a student, for business, conference, family or friendly visit, you'll find all the resources you need to do it by yourself in the given link