I'm not too sure I would recommend online dating to someone who's depressed.
Yes, going into it with a healthy and open mindset is essential. But being depression-free is not a necessary condition, and I’d caution people against establishing that type of artificial gateway for themselves. My belief is that every human is of infinite value, and nothing that happens in the online dating realm can subtract from that (“you don’t do arithmetic with infinity”, so said my calculus professor).