Pure retinol without stabilizers is pretty aggressive, especially if you're just starting out, so switching products is the right call. What I'm seeing in the other comments is that people are mixing two things up: yeah, you do need a moisturizer, but the order matters way more than they think. If you apply moisturizer first and then retinol on top, the retinol doesn't penetrate well and you lose effectiveness; what actually works better is applying retinol on clean, dry skin, waiting 15-20 minutes, and then doing your moisturizing. For sensitive skin I'd recommend looking into retinaldehyde (it's less irritating than pure retinol), encapsulated retinol, or just going straight for bakuchiol, which is retinol-like but gentler. With any of those options, use low concentrations (0.25-0.3%) and start two or three times a week, which is way less aggressive than what you're probably doing right now.