Publishing again acknowledging the original publication of oneself
That means that IJACSA will not try to stop you from publishing your work elsewhere.  (They'd have little reason to do so, as they are not profiting from it.)  It is common for open-access journals to let the author retain the publication rights.

However, no reputable journal will publish an article that has already appeared somewhere else.

You could "publish" it on your web page, or on arXiv, or as part of a book (though again, a reputable book publisher will probably balk if the content is just recopied).

Note: IJACSA is published by The Science and Information Organization, which is on Beall's List of Predatory Open-Access Publishers.  Its website makes the journal look very dubious, especially the ridiculously broad scope and the promise to complete peer review within 15 days.  I wouldn't publish there (or would I?).