Aside from your development skills and portfolio I think you have to work on your self-esteem. Even if you have great knowledge about js and react if you act like a junior who had no jobs before they wont hire you. I've gone through this and when I realized there are many companies in need for developers I knew I'm valuable. Be a little more confident and don't let them scare you - they need you as much as you need a job. Of course you have to have knowledge with this attitude, but it's easier to gain knowledge than gaining confidence. Just be optimistic, don't give up and I'm pretty sure you'll find jor full-time job.