I find that it's easy to finish a project when you have someone to hold you accountable to the project.
There are groups for everything - Sewing is not the exception. There is even a nation wide organization that one can join with local chapters. The American Sewing Guild. And for those that want to join a professional group there is the Association of Sewing and Design Professionals.
But what I love the most are small groups I love teaching the group I host once a month I forces me to pick a project and do it.
There are also Online groups to help keep you inspired and motivated.
This one I love:
And then there is a very unique sewing group that I've just come across during my 31DBBB adventure:
She puts out a questionnaire about a couple of items to sew and then they choose which the group will sew - then they sew and check in on her blog. I haven't had any spare time to join in. It looks like a wonderful group to jump on into!