Earlier quoted context omitted.
If you are willing to share, I'd be curious to hear more about your situation. I've seen salary plateau at certain career levels and ages (40s usually), but saying salary goes down at all (let alone sharply) is something that I expect is not a general truth about the market at large. My anecdotal data comes from ~20 years in recruiting engineers. There are several reasons you could see a salary drop (stagnating skill…
Would a significant gap in employment be that damaging? I was severely burned in an automobile accident (60%, 3rd degree) on June 6, 2006 -- and was completely unable to work for a couple years. It took a little over 4 years total from the date of the accident till I got another job. Every job since then has been with a startup.
So at this point, while a 4-year gap will still be a downward multiplier to some, the effect will be relatively mild.
Better to focus on the the sheer inner strength it must take (which I, and almost all these people summarily rejecting you, can only begin to imagine) to pull off a recovery like that, and how that makes a much more solid person overall -- and hence, a way better hire.