Like everyone else before me I would go for fixing it up. I learned a lot myself about bicycle maintenance in the past years. From adjusting derailleurs, over truing and building wheels to taking internal gear hubs apart. All not rocket science if you have some technical skills. There are tons of videos out there on youtube.
Derailleurs can be adjusted. All you need is an Allen wrench and a Philips screw driver. And you have to find a way to get your rear wheel in the air. For wheel truing you just need a spoke wrench. They only cost a few dollars. For a quick truing you don't even have to remove the wheel. You can adjust the wheel using the rim brakes as a "scale". Seats and grips are not expensive either.
The other two problem you will be facing right now:
1. Bike shortage. Bike stores and big box stores are out of bikes with bikes on back order for months. Our largest bike store in the area will not even take orders for bikes under $1,200 right now. Meaning if you want a new bike at a reasonable price you won't find one. And if you a buy a used one you still have to tune it,
2. Services appointments can take weeks right now. Many bikes store are currently booked out for the next 4-6 weeks.