I really enjoyed your whole post. Nicely done.

I would also choose absurdism.
I'm about to lose a job for a second time due to an acquisition. So I see meaning in work but it keeps being taken from me.
This time has been particularly devastating.
So maybe nothing does matter. I've done so much. So much for work. So much for my personal growth. In the end it literally didn't matter. It's being taken from me by greedy assholes.
I don't know now. Perhaps nothing matters. H
I think this is the problem with caring about stuff. It hurts when we then lose whatever it is. I guess that's where the nihilists and, perhaps the Buddhidts win- if they feel less or no value in or feel no attachment to things.
I'd still say it mattered though- because it gave you a feeling of purpose while it lasted. I'm so sorry you're going through this. It must be a very stressful time.
Perhaps we can 'adopt' certain perspectives to help us better cope in life. As someone who tends to catastrophize, the nihilist viewpoint can help calm me down. As in- does what I'm in a panic about
really matter at the end of the day? Also, being worried about failing in life can feel exhausting. So- to once again question whether it does in fact matter. Who am I striving for? Am I just trying to live up to other's expectations of me? Should I feel obliged to? Those sorts of perspectives can help soften the fear of failure- for me anyway.
I wonder if we all tend to adopt what serves us best though. For me- striving towards a creative career was my lifeline from a really early age. It more or less saved me. It certainly felt like it was my purpose in life. So- for a long time- that served me best.
I suppose since that career was always under threat. Because there were times I more or less quit even- I probably strayed into nihilism to help wean myself off. Does it in fact matter what I do? I suppose, with a suicidal bent too- nihilism is useful. Life doesn't matter. We all die anyway. Why does it matter if I bring the date forward?
For your situation though- I would say this... This is obviously a massive setback and disappointment for you. It also highlights the horrible uncertainty of the world and job stability. There again, it doesn't have to be the end. You may end up in a different job you like even more.
I started out on a different creative career pathway. After leaving uni, I spent 7 years working in retail alongside trying to get my career off the ground. I only had limited success. I likely would have limped on though unless I had gone to see an agent- who effectively (metaphorically) ripped my work apart. I felt utterly crushed. To some extent- the worst I've ever felt. All my hopes were dead for many days. It felt like my world was over in a way. Eventually though, I made the decision to retrain in another area. And- touch wood- I've done better there. It hurt like hell at the time but ultimately, it did me a favour.
So- serbacks don't always mean the end. They sometimes lead the way to better things. Not always of course. The whole: 'it gets better' is a ridiculous assumption- in my opinion. It's not impossible though.
I think we have to decide though ultimately. Do we still believe in trying to find and follow a purpose in life? Accepting that future failures may well occur and, they'll hurt like hell. Or, do we abandon hope, throw in the towel and let everything just peter out?
I think ultimately- where we think we'll be happiest tends to inform us. Would you be all that happy in a wage slave job or, going NEET? (If you can.) Wouldn't you still be pining for your career choice?
I'm in this weird limbo stage between the two. I don't have the drive I used to- which means I don't have the same motivation. I do have the same job and responsibilities though. So- I'm finding it pretty hard to still follow and fight for my purpose, when my heart has largely gone out of it. I suppose for me now, it's more that I'm marking time with something at least tolerable.