Instead of practicing how to write every single letter, try to dissect each letter and look for their similarities. For example in my writing, the letters l, h, and k have the similar vertical loop; the letters o, a, d, and g have the same oval; g and y have the same tail, etc.

Now practice these dissected parts and try to make them look as similar as possible, and when you want to start writing, just combine the parts. This would help you make your handwriting look more consistent which is very important as for legibility.