Ask for a meeting if you work in that kind of office or find a quiet moment if you don't and say that you'd like to discuss a payrise. Tell them that you do all work of the pay bracket above you and you deserve it. It's a business conversation not an emotional one.

Now is a good time because it's near the end of the EOFY.

Don't drop hints. It is so annoying when someone drops hints instead of asking.