When you have finished either change sandwiches or continue on the same one and start practicing your cursive C. It can become an S if you like just work on those curves, smooth them out. That may mean slowing down as you approach the curve or barreling through it. Just fill your work area with them.
I do not have any tricks to make you a really good quilter. This is something that takes hours a day of practice. Yes, you heard me hours. But as you get comfortable with the alphabet its time to start working on those stitches. You will have a nice stitch when the speed of your hands meets the speed of your foot pedal, you can almost hear it happen.
The stipple-when you are ready start turning the C's into the most common of the meanders the stipple. This "puzzle piece" design is meant to fill large areas of quilts. The thing I think about the most when doing mine is "Don't cross your lines" and "Don't stitch them in nice neat even rows.
Your E's will eventually become a meander that looks like this. I use it quite often in one form or another.
Or a flower with a leaf, the options are endless with this meander.
When you pull the tape off you have a nice straight grid, in even rows.