First issues with 2012 WRX Hatchback

Hey guys, I recently bought a 2012 Wrx Hatchback off Facebook marketplace for $4500 usd. There were some noticeable issues but nothing too serious when I bought it. I knew it needed some love and was excited to learn how to work on my car. It ran pretty well for 2 months then just yesterday I filled the transmission oil because it has an axle seal leak which was on the list for fixing. I turn the car on and it struggles to idle and dies on me. I take it for a drive and it has significantly less power, feels sluggish and unresponsive. Dies on me when going into a turn in 2nd gear. As I was going up a hill in 1st the RPMs shot up and I smelled a burn. Exhaust was red hot. Not sure if my clutch died or my turbo failed or both. I don't think its drivable at the moment. Any ideas what it could be?