I'm a bit befuddled by recent events. I've been on Upwork a while now. Usually, I get a high rate of responses to my proposals, but recently only 1 potential client responded after well over a dozen proposals, probably more. I'm a highly experienced instructional designer. I keep my fees reasonable, and have excellent samples and references.
What is 'usually'; what is 'recently' ?
Might be that you're having a bad period which happends to everyone from time to time. Might be that you are doing just as good as before; only now noticed that some days aren't as good as.
If you're having a really long unsuccessful period, that's unfortunate.
Push through; obviously you are aware that you'll get on top.