Under Trump my pay went up over 25% and my taxes were lowered. I was able to buy a house at low interest, about 2.3%, and buy new vehicles at similar or lower interest rates.
Business was going gangbusters, and I rapidly advanced in my career.
Yes this is known as a "debt bubble". Your own experiences are part of it, but the systemic driver of it all is megacorporations gorging on cheap debt (to be paid for by our children) to buy assets (including their own stock, and including houses fueling the housing crisis), along with hiring people (there's your promotion) with all that "cheap" money-that-is-actually-intergenerational-slave-labor).
Inflating debt bubbles is great fun while it lasts, especially if you can blame an opposition party when it bursts. That doesn't change the fact that it's disastrous economic policy, that conservatives happen to be ok with because half of them don't understand it and the other half are promulgating it.
Under Biden you’re looking at about triple those rates, grocery costs have skyrocketed, and gas has hovered at $3/gal for most of his presidency.
You can't credibly blame all of this or even most of this on Biden. The only fundamental way to reign in inflation is to increase interest rates or increase taxes. You blame Biden for raising rates, even though that's one thing that might help the other problems you list. You praise Trump for keeping rates low, even though that was gasoline on the current inflation fire.
What my salary buys is a lot less and the economy slowing is going to affect my paycheck directly, quite possibly if it gets slow enough I won’t have a job anymore.
Sucks paying those bills back doesn't it? It will get worse before it gets better, if it ever does. Rest easy though.... you are part of the cohort that at least had a chance to dance for a while before the rug was pulled out. Enjoy those pre-inflation raises and pre-inflation asset purchases...those coming behind you will only see the burned-down dance hall.