You could add another 6-10 neon tetras and 3 more bronze cories.
I would do a bigger water change, 50-75% each week, along with your gravel clean. The bigger water change will help dilute nutrients and disease organisms better than a small water change.
Make sure any new water is free of chlorine/ chloramine before it is added to the tank.
Your feeding is fine as long as all the food is eaten.
Assuming you have a light unit on the tank, I would add some more plants. Some good plants to try include Ambulia, Hygrophila polysperma, H. ruba/ rubra, narrow Vallis and Water Sprite (Ceratopteris thalictroides/ cornuta).
The water sprite floats on the surface but can also be planted in the substrate. The other plants should be planted in the gravel. Floating plants are good for tetras and cories.
Have the tank light on for about 12 hours a day. If you get lots of green algae growing on the glass, then reduce the lighting period by an hour a day and see how it goes over the next week.
If you don't get any algae growing you can increase the lighting time a bit.
If you get a bit of green algae but not too much, then it is about right.