The only bit of advice I would suggest is that you consider the technology stacks used by such (or other large) companies. I'd definitely look at acquiring experience with a VM framework (ex. .NET or Java) as you can benefit from that knowledge using multiple programming languages and many companies prefer such experience.
Alternatively you should also consider doing some certifications - especially for junior roles. The next best thing to employed experience is freelance/consultation experience. I personally prefer if candidates do have experience freelancing as it indicates a certain level of competence in multiple areas (project management, planning, delivery, communication etc.). If you are good enough as to bill for your time, then so should any company planning on hiring you :)