Sometimes you just have to accept reality. I wish it were different, I truly do. I liked Perot and I liked the Reform party but they imploded. If I remember correctly, Perot won about 20% of the popular vote and got zero electoral votes. The deck is stacked so much in the duopoly's favor, it's just not realistic to think anything will change in our lifetimes and if all you want to do is plant seeds now, there is no guarantee that those seeds will ever grow.
Libertarians have had it all backwards in wanting to capture the presidency without getting members of Congress first. In fact, Libertarians themselves (I'll just pick on Ron and Rand Paul) have given up on the Libertarian party so much that they run as Republicans because they know they would have no chance of winning on a Libertarian ticket. So, I guess their hope is in being moles, but they are lonely moles, surrounded by wolves.
The fact is, our founders set up a two party system and that system is about impossible to crack. It hasn't been done in around 170 years. I personally would be in favor of cracking the system but those who say, "just vote for someone else" is an oversimplification. And, as much as I hate to say this, what if a Republican or a Democrat is actually the better choice of the available candidates? The fact is, third party candidates over decades have all been pretty worthless so, just to vote for someone else, may actually be the worst choice. Perot may have been a good one for the economy but how would have foreign affairs been under him?
Fact is, in the 2016 presidential election, I wrote in John Kasich, the person I had supported in the primaries. There had been talk about him running in the 2020 election as an independent, with Colorado's democrat John Hickenlooper as his VP. Now that would have been good for the country and it would have been interesting to see how well they would have done. It could have really united the country. But, it never came to pass, so, back to the duopoly where we have a solid 25% of voters who will never vote anything but blue and another 25% of voters who will never vote anything but red, leaving about 50% who would be even capable of voting "other".