Get dipped and join the glorious ranks of the evolved human race? I see no other way to refine a prime normal.
(Of course I'm going to be 100% about being a super mutant.)
To understand super mutants (and the question posed within its defined parameters), becoming a super mutant doesn't naturally impose retardation in the subjects. However it is influenced by multiple factors such as;
Base line intelligence
Genetics (yes inherent genetic traits are a factor)
Exposure to energy such as radiation (Currently no scientific data on unacceptable exposure amounts that lead to deformity)
Purity of the FEV strain
Form of FEV strain exposure (liquid, gasous, etc..)
Condition in which the patient is "dipped" (lab settings vs. an oil drum)
Factors like these can greatly change the variables of individual metamorphosis. The end result of an ideal candidate coupled with correct exposure practices will yield a viable super mutant without the deformation of intellect. Granted sterility is still an issue, last I checked it could be a case of a hormonal reset. To break it down in lay man's terms it could simply require the newly metamorphosed meta human to go through puberty again.
However if this is not the case, if dipped, and the individual retained their intelligence. They could easily work with others of their ilk to correct the issue. The reason I think this is a viable strategy is because the Super mutant will now have a much longer life span.
Since the question does not impose the restriction of the Fallout setting, we are free to assume the individual in question will have or can obtain resources to find a solution to the imperfection.
Bear in mind that many of the cookie cutter super mutants that were created was during the fledgling use of the "dipping" technology, which over time, and through scientific progress yielded to better results and refined practices.
When you get down to it, humans are in a similar struggle. We humans are trying our best to delay the inevitable that is the conclusion of death. Either we evolve genetically or we jam ourselves into machines, the result is the same. The end of the Human species and the birth of another. The choice is whether we choose to evolve, or risk natural selection working in our favor.