You can say you don't feel like it all you want, it's not going to change Duverger's Law. Math doesn't give a damn if you "feel" like you're not wasting your vote.
That's more of a simplified hypothetical trend, than a law. Witness the NDP's comeback in Canada after being fringe of the fringe, vs the PC party's demise after having been dominant for decades. If there are multiple axes/spectra on which voters rate the parties, multiple parties can exist in a metastable state; one party wins on economic issues, one party wins on defense issues, one party wins or social justice issues, for instance, With just a one axis system, there will always be only one party closest to the centroid of public sentiment on one side, and a second party closest on the other side, and parties any further out will die away. (Basically, the same system commercial establishments tend to cluster near the centers of towns, or suburbs, rather than out in the middle of nowhere).
But if there is more than one axis, there isn't a mathematical requirement that one party be significantly further from the centroid that the others, so it's metastable.
That's actually the way the US worked, for years; if you hypothesize another "party", the dixiecrats at one time, generally the south/southwest; and two axes, one the general "liberal/conservative" axis of economics vs social spending, etc.; and the other axis kind of a minority rights axis. When the dixiecrats were tied to the Democrats, that kept the party as a whole kind of orbiting the centroid of the voters, with the Republicans floating around in response. But when they got severed from the Democrats and tied to the Republicans, that removed the counterbalance in the Democrats, and the Republicans didn't have the same counterweight in their party, so basically gravity broke up and both parties are flying out of orbit.