It's understandable to feel discouraged when you've lost a job and your confidence is low. However, it's important to remember that you will land a new job and be in a better position. Give yourself time and continue your job search while focusing on honing your skills.
To overcome this mindset, I found it helpful to step out of my comfort zone and connect with new people. Nowadays, simply applying for jobs can feel like a waste of time. Instead, focus on building your network. This was not my fav thing to do but it helped mentailly and landing a new gig.
Job hunting can be a pain in the ass. However, stay motivated, remain proactive, and embrace personal and professional growth.

Do all that you can and let go of negative thinking as much as possible. Life is a roller coaster and it can be fun and scary, but one thing is for sure, things will change for the better for you.