How long ago was it since you tried for the green card. When I did it before the time of computers, it took quite a while but I had my green card within nine months or so and citizenship 3 years later.Had a wife and three US/UK dual nationality kids. Tried to get a green card. What a lengthy nause. Gave up in the end and stayed in UK.
For me the biggest pain was travelling down to London from Edinburgh for something that took 20 minutes to complete.