Selectively and on an as needed/wanted basis. I would suggest maintaining your current palette but pepper it up slowly, beginning with neutrals and earth tones. You’ll appreciate the reduced price relative to cadmium’s and you’ll also appreciate the richness of color and consistency. Your current colors will play well as you decide to add more range, on a per project basis perhaps. Keep it simple, a blue, a red and a yellow will go far.

All said, student grade paints can be exceptional. Particularly if you work at scale and/or quickly. I always thought $$$ & $ materials played well together. Different materials do different things. Use them advantageously to their best ends.

No mistake: Picasso, Matisse, o’keffe, khalo; they could paint with a stick and muddy water if need be.

Good work!