Hello from Texas! So glad you joined the Quilting Board & it sounds like you are well on your way to being a great quilter. This is the only free online quilting design program that I am familiar with. I'm not very good with things like this but my daughter helped me try to learn how to use it a few years ago. I think I've forgotten everything that I learned as I did not ever really use it much. I hope this helps you.
https://quiltassistant.com/free-quilt-design-software