There's loads of things, some of which have been mentioned, but try these.........
Get rid of the nose-rings, tongue-rings, ear-rings.
Supply your home address on flyers/cards/invoices/receipts, plus a landline number, [in addition to the ubiquitous mobile number].
Fifty per cent of those on this list need either to learn to spoll correctly, or at least get someone who can, to check all your written and printed matter before dumping it on a hapless public.
Also include that which is printed by professionals - they are not always up to scrotch.
If you have arranged to be at an address at a particular time, then BE THERE!
Remember. Just as people spread the good word about you to their friends, then so they spread the bad.
Baldeagle in Staffordshire