How do I make a paint on a textured wall more shiny?

I textured my bathroom wall and sponged color mixed with a little glaze over the texture. I like the general look but would like it to be shinier. Is there something I can just sponge or paint over the color?

You might try something like clear urethane but I would do a test on something else before covering the entire wall. If you have any left, paint a board, let it dry then try the urethane.

Pay strict attention to the flammability warnings on the can. When drying, some such products are subject to flash if there is a spark near the vapors.