Hi Mary !
You're very beautiful with your curls
I have fine hair and I want volume, just like you !
Maybe if your curls seems too thin, it's because of the crystalization of the gel when you style your hair. You can scrunch your hair when it's dry and your curls will looks more voluminous.
More infos here : How to Apply Hair Gel
To have more volume at the roots, you can try the clipping technique. I haven't tried yet because I don't have clips so I can't say if it really works. I've found this great article to explain it with some pictures : Clipping Roots for Volume | Healthy Curls
And thx princesslea for the tip about the pixie method, I'll try it !