You don't have the speed to place trades within microseconds, to have speed advantage, so you have to ask yourself whether you have the advantage of clever algorithms to identify market inefficiencies that persist over long periods.
You surely realize that every investment bank, hedge fund, private equity firm, etc. is paying hundreds of thousands a year to rather smart people whose job is to identify market inefficiencies and turn them into arbitrage. That would be your competition, except that you are underfunded compared to them.

It's absolutely possible to make a decent living out of this, but it's not easy. On the upside, if you can do it successfully,then you could easily increase your profit several times even orders of magnitude by selling those skills to a financial institution (if you like the insane lifestyle that it entails).