What could I do better for my definition?

Hi! I’m new with all of this wavy routine. I had pretty frizzy hair and had a lot of breakage so i cut my hair and have been trying to get my hair some definition, as you can see I do have waves in my hair but at the end of the day most of the waves are almost gone. Now, since I’m new I just bought some mousse and Tresseme leave in that were cheap for trying this out. Algo I’ve been using my husband’s hair wax with water bc I don’t have any gel at the moment. I don’t diffuse since my hair is super fine and I don’t want any damage. What do you think? What could I do better? I guess finding better hair products is the first step! Have any recommendations?

Hi! I’m new with all of this wavy routine. I had pretty frizzy hair and had a lot of breakage so i cut my hair and have been trying to get my hair some definition, as you can see I do have waves in my hair but at the end of the day most of the waves are almost gone. Now, since I’m new I just bought some mousse and Tresseme leave in that were cheap for trying this out. Algo I’ve been using my husband’s hair wax with water bc I don’t have any gel at the moment. I don’t diffuse since my hair is super fine and I don’t want any damage. What do you think? What could I do better? I guess finding better hair products is the first step! Have any recommendations?