Should I keep my 2004 BMW 1 series 120D or should I get rid?

I have a 1 series BMW 2004, 2lr diesel 120D, 166000 mileage

It has been idle for a year due to the pandemic. I recently decided to use it again and the battery is obviously flat but wouldn’t start so I bought a new battery. Despite the new battery it wouldn’t start so managed to jump start it a few times to get it running. It only managed to drive it around my area and then to the garage for servicing and MOT. I drove the car for almost an hour but once at the garage the car would not start again. The ABS light came on the stability traction control light came on, and when driving to the garage the car started shaking as I accelerate. At the garage it’s been 2 weeks and the guy hasn’t bothered to look at my car. Every time I call him he says he is behind with a few jobs. I’m getting fed up of waiting coz I feel like the reason it’s not being fixed it’s because it’s a big job. I just find out the car is on recall from BMW. Should I take it to the BMW to fix it (which I think will be expensive) or go for a cheaper garage. Should I even bother fixing it or should I just get rid of it?I’m fed of using Uber when I have a car.