I have an average IQ and interest in many subjects, but my operating memory is confirmed borked, I have heavy ADHD symptoms, and the most ADHD unfriendly life you can imagine.
It really does feel impossible to make meaningful advancements.
But I do feel that, even if you can eventually memorize and build on knowledge, there is just a world of difference in what a 70 and 130 IQ person can do.