The nice thing about Oanda is they allow you to make trades with very small, precise position sizes, which is important for trading a small account profitably.
To understand why small (relative to your account) position sizes are important, look at how casinos operate. They have a very small edge, only a few percent in most games, but they are able reliably generate huge incomes from this edge because each bet they make is very small in relation to their total stake. The reason their small edge is reliable is because they make many small bets, and so over the large number of bets they make, they can rely on the law of large numbers to cause their small edge to manifest itself as winnings. If they were to make large bets with their small edge, they would be very likely to deplete their capital and go bankrupt, but since they stick to very small bet sizes, their edge becomes reliable and they make money.
A common mistake of traders, even traders with a good system, is betting too large relative to their account size, which makes it nearly inevitable that they will blow up their account at some point.
So if you want to get steady results like a casino, find a good edge and keep your bet sizes small enough that you can stay in the game long enough for your edge to work.