Mild retinol suggestions

Hello! I currently use the Inkey List retinol serum. I've been using it for a few years and feel like it's time to switch to something a little more effective. Does anyone have suggestions for a milk, under $50 retinol serum that's easy to use?

I'm on spironolactone so I don't really have to worry about acne, but I do have some minimal scaring and texture/bumps I'm trying to get rid of. I've really been loving K Beauty brads as of late, but I'm open to any product suggestions!