Note, I am a career academic scientist.
Obviously, it should not matter if you are an individual or an institutional scientist and the science should stand on its own merits. Unfortunately, the signal to noise ratio of quality papers coming from non affiliated individual submitters is probably bad enough that most journal editors would rather not take the time or risk to send your work out for peer review. (Think of all the perpetual motion machine crackpots out there still). In most fields, peer review is a voluntary system of review for which reviewers are not compensated and requires substantial effort, so editors are loathe to ask volunteers to review a suspect manuscript fearing it will poison reviewers to subsequent inquires.
Practically though, one way to look more credible is to incorporate (this is inexpensive in most states) and submit it corresponding from the corporation. Another strategy is to find a co-author at a research institution. This may be difficult because academics in my department get a surprising number of calls like this from people who are usually either disturbed or obviously idiotic. But most academics I know will take these calls, especially the younger ones. They might be able to check your work from a different perspective and can certainly help with the arcane apects of manuscript preparation, tone and format.