When you have hope in the voting system there's less motivation to educate yourself about history and current events. "We know what the problems are: let's just vote them away!" You need to be motivated to educate yourself because it's much easier to accept dominant narratives than to admit how little you know on any given subject.
On the flip side, abandoning electoralism requires an independence of thought that lends itself toward questioning other narratives. Once you realize you've been fooled before, it's obvious that you likely hold other beliefs that don't align with reality. At this point, you have ample motivation. Personally, this is when I began reading leftist theory. It's easier to question the system after you've been disillusioned.