When I am in situations like this, I try to focus on the process, not the outcome.

Find joy in applying for new jobs, learning about system design and algorithms, or doing practice interviews.

If you follow the process, you will find that job.

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On a side note, I would encourage you to not lower your pay or communicate you will accept lower pay, because its a signal to employers that you're desperate, no one wants you, and they too should be cautious to hire you. As one of my old favorite managers once told me, "when I gave you that offer, I wanted you to walk in on your first day smiling"