> I applied and got rejected without feedback. They stated that there was a high volume of strong applicants (if there were, why are they posting again?)

This is the case for the vast majority of companies posting jobs here and elsewhere (e.g., LinkedIn) right now. I've been looking for the past 7 months after a lay-off and that exact reply is the most common response I've seen (because it's an automated response). Well, most common after not hearing back at all, of course.