I was diagnosed with MDD, I had no mood, suicidal thoughts, tiredness, emptiness, sadness, helplessness, miserable, yadda yadda.
because of that, my work quality has been going down the hill, and even absent from work.
long story short, i got lot of warning letters, i got even more stressed, and decided to quit my job.
i been working for that company for 5 years without a problem, i know its stupid, but i can't think clearly during that moment.

I've been unemployed for 3 months, and now i think im ready back to work again.
i been on several interviews, but when they asked why i quit my last job, i just told them that im seeking new opportunities and wanting to learn something new.
but failed to land a job, i think because i cant explain why i quit my last job. especially when they actually offer less salary.
what's best to tell the interviewer why i seeking new job?
i don't think being honest can be helpful, im still on my medication seeing a psychiatrist once a month.
i don't think any employer would employ staff that for sure would taking off day once a month.