My manuscript got rejected by the journal I submitted to. What do I do next to ensure I get publishe

You can't reasonably expect a helpful answer here with no more information than that. What sort of journal was it? What was the burden of your article? Were you rejected as the result of peer review? Were you rejected on the basis of the quality of your writing? How can anyone here answer your question when we have no more information than you have provided?

Further, check your rejection letter. There are usually clues buried in there, e. g. is it that they don't want to publish it at this time, or did they think your research wasn't up to snuff?

What they said

Go to 'Forward Press'.
They printed my crap in 35 languages, 75 countries, all major uni's and National libraries in the western hemisphere.
Dude, trust me 'internet' is shite - go paperback, get archived!

How much did you have to pay them?

Walt Whitman peddled his book door to door. It's good exercise.

About 5 pounds a copy.