That's a huuuuge argument, but let's start slow.
First of all double cleansing could be a huge helper, but I've seen many people with acne not agreeing with cleansing oils so I would reccomend micellar water. This is so that you clean out any superficial exess sebum that might end up clog your pores.
After that I would reccomend you introduce some soothing products that will calm down the inflammation and prevent it from coming back: my fave ingredients here are mugwort, more on the soothing side, and tea tree, wich also doubles up as sebum regulating!
After that you could add exfoliating acid like bha or aha, but remember to introduce it slooowly. Don't use it more than three times a week.
Remember to wait at least one week between a new product and the other. If none of this works in reducing you acne you could try introducing retinol, but that's a whole new subject that deserves an in-depth analysis on it's own. Also it may have numerous side effects so I woul leave it as a last resort.
Of coure make sure you are mostruizing your skin with a product that is not too occlusive so you don't clog your pores, but also mostruizing enough to keep the hydration in!
Hope I have been helpful, I could not really go in detail of everything because this is a very big subject, but if you have any question don't hesitate to ask! I will answer as soon as I can!
Goodluck with your skincare journey !! 🥰🥰