Correct. There is no way to increase intelligence whatsoever. You are stuck with what you are born with. It was all predetermined when your DNA was conceived at birth after your father’s sperm cell fertilized your mother’s egg. You can find studies on Promethease that show the RS genes responsible for intelligence after taking a 30X genome sequencing test.
Even on the off chance that epigenetics does occur, it is likely that it happens during childhood and adolescence when your cells are receiving instructions for development and specialization which is affected by diet, pollutants, and environmental stressors.
But genetic mutations do occur where it’s possible for two unintelligent people to give birth to a genius and vice versa where two smart individuals give birth to a moron with gene recombination. If you’re born with a below average IQ but take advantage of neuroplasticity at an early age it’s possible for you to raise your IQ 5-10 points.