COVID's Impact on Job Searching

I've been at my full-time retail job for the past two and a half years, and was told at the beginning of the month our US store operations will be closing at the end of the year. Therefore, all on-site employees, including myself, are getting laid off. To be honest, I wasn't surprised this would be happening seeing how hard the retail industry has been hit by COVID-19, but processing the shock is still taking time. I've been wanting to make a career change recently, and have been applying to jobs constantly since August. Only less than five companies came back to me with interviews, and I've already applied to over 100 jobs. Is anyone else in a similar situation? How have you been persevering and what do you do for self-development while you're not searching for jobs?