People can tell when someone is trying to hard to impress them. Don't make yourself sound desperate or sales-y when marketing your product or service. Be genuine when it comes to approaching customers. Try to make a genuine concern on your customers problems and situations. At the end of they day you will attract more clients by being truly genuine.
"I think a part of being successful or trying to be successful is staying true to who you are. Be genuine." -Tessanne Chin