Of course you want to ask why they didn’t apply. Did they find a better place, a cheaper place, a better and cheaper place? Did they see something that disgusted them? Did a neighbor or the neighborhood worry them?
What can it be other than pricing or marketing?
To me 22 days is a very long time. You’re about to be down 8% of your rent due to vacancy. So if lowering the rent 8% would have filled it you would have been ahead. If you go another month then 16% lower would have resulted in more income.
If you aren’t using a PM have you considered it? There are only a few outcomes. They tell you you’re asking too much rent (you lower rent, avoid vacancy and make more money) ,your marketing is bad (they take new pictures, advertise in different places, change wording, whatever, and get a tenant saving vacancy.) your pricing is good and your marketing is good, it’s just a slow time and even lowering rent won’t help. (You know you’re on the right track and you insure future leases end between March and July by varying the length of the new lease.)
Good luck.