start showing your quilts you've quilted to friends who quilt- see if they like what you are doing- and would like you to quilt theirs---word of mouth is the only way to build a quilting business- as more and more are happy with your work- they tell more and more people- before you know it you no longer have time to make quilts any more- you get to spend all your time quilting other peoples quilts instead.
i know a few who after 5-10 years of that they quit---because they didn't want the stress- didn't want to spend all their time working on other peoples quilts- and just plain burned out.
before taking on other peoples quilts make sure you are good at the size they may bring you- if your only quilted kids size quilts and someone brings you a king...you may find yourself in a bad situation...so practice practice practice is important---and before you decide to quilt some one elses quilt have policies figured out and prices---ask lots of questions...
it really is not something to jump into without tons of PRACTICE and research...
did you tell the folks at the lqs you were not happy with the quilting job you got? problems can not be fixed if they do not know there's a problem.
communication is very important. .. as important as the quilting