Find work that speaks to your strengths, whatever they are. Some people aren't very smart but good at communications, or nice, or creative, or attentive, or can do boring tasks over and over without getting bored, or could sell snow to Norwegians in winter - there is a myriad of qualities beyond intellect, and one has to be truly exceptionally unlucky to not be good at even one (usually there are a few). The trick is finding what you're good at, and what you like to do, and if you're lucky there's intersection between the two, and if you're lucky, there's somebody somewhere willing to pay for it.