Select First Track? Unmute and Solo

Thanks for the help, Chris! 🙏
The updated script didn’t fully work for me just by changing "first" or "last" at the top — a few other lines still referenced the first track directly.
Here’s the version I put together — not sure if it’s the most proper way to do it, but it works as expected for me :)

const desiredTrack = "last"

sf.ui.proTools.mainWindow.invalidate();

function getSoloState(trackName) {
    const track = sf.ui.proTools.trackGetByName({ name: trackName }).track;
    const trackHasSoloBtn = !track.title.invalidate().value.endsWith(" - Master Track ");
    return trackHasSoloBtn ? track.isSoloed : false;
};

// Get first visible track in session
const visibleTrackNames = sf.ui.proTools.visibleTrackNames
const firstTrack = visibleTrackNames[0];
const lastTrack = visibleTrackNames[visibleTrackNames.length - 1];

const targetTrack = lastTrack

// Define first track solo button
const firstSoloButton = sf.ui.proTools.trackGetByName({ name: targetTrack }).track.buttons.whoseTitle.is("Solo").first;

if (getSoloState(lastTrack) == false) {  // If track isn't solo-ed unmute track and click solo button
    sf.ui.proTools.trackSetMuteByName({
        name: lastTrack,
        targetValue: 'Disable'
    });

    firstSoloButton.elementClick();

} else {

    // If track is solo-ed mute track and click solo button
    sf.ui.proTools.trackSetMuteByName({
        name: lastTrack,
        targetValue: 'Enable'
    });

    firstSoloButton.elementClick();
};