As they say, first impression lasts. So, make a brief and concise profile and showcase your skills. Then, try to ifentify your niche and stick to it. Find clients that are seeking for freelancers on the niche you've chosen. Submit a proposal that will target to solve the client's problem. Let them know how your skill can help their business grow. Everything else will follow.
Good luck on your first job offer!
If you are new to upwork and don't have any previous jobs on upwork then it might be hard to get your first job, because you don't have any experience on upwork and most of the clients want an experienced freelancer.
So here are few tips:
I hope these points will help you in hunting your first job on upwork. Beside this your profile picture would be professional and your about section should reflect the same niche experience in which you are huting your job.