And yet (at least from an outsider perspective) libertarians are closer to democrats than republicans
I'm an outsider too, but here's my take on this
For the most part (certain exceptions exist, like guns), democrats seem to be about individual freedom from government, but they want government to regulate corporations.
Republicans are more about corporate freedom from government, but they want government to regulate people they don't like (women, LGBT, immigrants).
Libertarians ideally want corporate AND personal freedom from government, but a lot of people only want personal freedom from government if it applies to "their kind". So they're really republicans.
I'm not gonna answer that question. I don't have the perfect answer ready for you.
Instead I will tell you what happens when you vote third party in FPTP. Okay, you have a .nl TLD so I guess ssyou're either in a much better electoral situation or just picked it because it's cool, but I will use the example of the upcoming US presidential election.
Now, let's say the race is really even and it's over. Flipping just one of several key battleground states would've placed Harris in the lead, but unfortunately, Trump won. You look at the votes in your state: Trump won by under 600 votes. Nearly 100,000 people voted for a third party candidate that's actually to the left of Harris. They would've preferred Harris, but because they voted third party, they elected Trump.
If this sounds familiar, that's what happened in 2000. Al Gore could've won. Should've won. But 3rd party candidate Ralph Nader was further left of him and received a bunch of votes that needed to go to Gore. In Florida, he had nearly 100k votes, and the difference between Bush and Gore was literally triple digits. And it wasn't even the only state where Gore lost because of the Spoiler Effect
It's an inherent flaw of the FPTP system and yes, it sucks. It means a vote for a third party is a wasted vote.