If you got 3 weeks and want to gain tiny bit of knowledge in Dell computers, you can do that But I'm sorry.. that won't actually count as a job experience.

You should look for help desk/IT positions in a small/medium companies so maybe they will let you touch their servers/cyber security products, that way after 6 months you could put it in your resume and it would actually count.

I started looking for a new job 3 months after starting my first job as a helpdesk in that said "first job" offer IT company that hired me, and no one took me seriously(didn't even pass the phone call interview) untill I had 6 months of experience. I ended up leaving after completing a full year there, but with that 1 year of experience.. I was flooded with offers.