In the US electoral system, voting third party doesn't send a signal. It throws away your vote. Let's take a look at what voting third party has done.
1. Voting for Nader led to Bush Jr. winning the presidency in 2000. 2. Voting for Jill Stein led to the first Trump presidency in 2016.
So you got that going for you.
Kinda like how the Libertarians got ~3% of the vote 2016, and over the following years the Libertarian Party of New Hampshire was taken over by groypers and the national LP endorsed Trump in 2024? I mean, in an ideal polity you'd be right, major parties would pay attention to where they're losing votes at the margin to inform their policy decisions. But we live in a far-from-ideal polity where the two major parties systematically undermine minor party candidates at anything above the county level.
In my case I've decided on criteria is has not held this office for more than one term (that is I give you two terms no matter what office you are running for) because no matter how much I agree with you I don't want anyone to spend too long in government.