Am I just lazy or is ADHD and burnout hurting my job performance?

I am often told my work is not good enough even though I really try and want to be motivated. I am a custodian at a high school for context. Last year when I first started I caught on quickly. However over this school year, I feel like I am slowly losing interest. I was homeless from June til just a couple weeks ago. I was also diagnosed as ADHD since I was 3 years old, could my ADHD be factoring? Am I just lazy? Is it burnout? Why do I feel like I really want to try but can't get motivated? Is it my fault?
Updates
2 mo
4 people have been fired in the past month at my cleaning company out of like 20 as well
Am I just lazy or is ADHD and burnout hurting my job performance?
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