Social democracy and social democrats are more focused on maintenance of the current society than on fundamentally changing it, and the most critical part of the current society is the domination of one economic class (the ruling class, bourgeois class, whatever you want to call it). This party, as a social democratic party and not a revolutionary socialist party, is more interested in the maintenance of the gains they’ve made while not challenging the fundamentals of bourgeois class rule. Necessarily though, that means they’ll abandon trans people like us, so this makes sense in a sad way. Much like how liberals and social democrats will talk about their lofty goals, but ultimately cooperate and work with fascists and fascism; when revolutionary changes are taken off the table, backsliding is inevitable.
You shouldn’t blame yourself or voters in your country. It was the liberal party in the US that failed to garner any support due to it’s support of genocide and other factors. These are failings of the political system both countries have inherently that are designed to fail this way, they need to be overthrown and not negotiated with.