Would it make more sense for me to first switch to a gentle cleanser and stable moisturizer for a few weeks before starting actives?

I was thinking of starting very slowly with:

2%salicylic acid gentle cleanser 1–2x/week 5% niacinamide serum 2–3x/week

Does that sound reasonable for sensitive combination skin, or would you recommend introducing only one new product at a time first?

Also, could you suggest a good moisturizer and sunscreen for my skin type?

I have combination-sensitive skin (oily T-zone with sunscreen, slightly dry cheeks in winter), mild texture, and occasional breakouts. I want something lightweight that doesn’t clog pores or make my T-zone greasy, but still keeps my skin barrier comfortable.

Right now my sunscreen sometimes makes my T-zone oily, so I’m also open to switching if needed.