Long story short, it's not just Trump's fault. Y'all keep glancing over the 2010 budget cuts like that wasn't a thing. Not to even mention how LIB disappeared into thin air a year later. And just because Biden became president elect dosen't mean the problems will disappear overnight (even with plans for re-improving Amtrak).
MTA heads were already terrible with budget management. What Trump did to "stall and look good" (during a pandemic at that) made it just worse.