Is it better for skincare beginners to use fewer products?

My skin is getting worse, so I want to buy and apply various products, but I'm worried that applying too much might actually make it break out even more.

Right now, I'm only using a facial cleanser, moisturizer, and sunscreen, but I'm wondering if I should add an ampoule or toner as well.

I've also heard that it's best to keep your basic skincare routine simple for acne-prone skin. Is there a fundamental routine that a beginner should definitely follow?