TBH mate id hate to be starting again.some of my customers have already had 5 different leaflets from window cleaning companies this year alone.its certainly very competitive out there.more than in 1993 for sure in my area.
BUT if you want more work you will get it if you try hard enough.leafleting,canvassing,FB,website and advertising in local magazines.also offer to clean f/s/g,conny roofs,solar panels,gutters......even inside window cleaning if you need the money.
i would also go and knock on your ex customers doors too.i bet you end up picking a few up here and there and (over time) get most of them back if you did a good job and the customers liked you.
i lost a fair bit of work due to illness myself over 10 years ago.luckily for me i sold the rest of that part of the round(which was mainly underpriced anyway) before i lost the lot.i also had other rounds in other areas that i managed to keep ticking over and then as i got better and went wfp my round just exploded into what it is today.all my newly acquired work(picked up in the last 5 years or so) has been picked up through walk ups,word of mouth and recommendation with virtually no canvassing/leafleting.
i dont have a website or FB page either and ive never advertised in local magazines.
a logo d uniform and a clean sign written van with matching business cards,etc are essential IMO for making you stand out from the other window cleaners in your area(your branding if you like).
good luck