You have beautiful work and here's my 2cents of advice, based on assumption you're looking for picture book illustration agents.
Add more illustrations relevant to picturebooks to your portfolio and social media. Make sure there some full page or spread illustrations with a few in a series that show that you can do backgrounds, and draw a character consistenly. Add those to your social media feeds too.
Your drawings are beautiful, but it is a style I see a lot of illustrators working in. Many agencies might already have several illustrators working in that style, so maybe think if there is a subject that you could specialize in, or if there is a way to tweak your style so its a bit more of your personality. While in animation this style is great, because a studio will have several animatos working on a big project and their styles need to be consistent w each other, in book illustration having your own style is really key to stand out from the rest.
Hope that's a bit helpful. If you happen to be a member of scbwi.org they have the handbook that has all agencies listed. When you want to apply to agents again, its an easy resource to use to look up all the agencies and agents, and see who is open to queries.