Are there any Fiverr.com gigs or the like that can help effectively with marketing?
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If you mean that are there people that you can help you with marketing? Sure there are and if you mean that you would do some gigs? Sure that would help. A little networking is never bad. But the effectiveness of that is not very good.
This sounds pretty vague but for game developers it's important to build a community. This means that you gather people around you that will buy your games consistently. The trick to getting your community is to make people excited about your projects. If you'r game is called "Boring ball game", it's more unlikely that anyone will support that.
When you build a community, you don't have to market that much in the future because those same people are always there to support you.
Good luck in whatever you do!