David Platt delivered a message on Ruth and Adoption at the Adopting for Life conference at Southern Seminary in February of 2010. It is a very powerful sermon with a seriousness and a hope, which I hope you find very inspiring.
Please listen or watch and pray that God would speak to you.
More videos and resources are available at http://www.sbts.edu/resources/category/conferences/adopting-for-life/page/1/