You’ve probably read that if you roll your clothes before placing them in your suitcase, you will be able to fit more. Plus, clothes don’t wrinkle as much.
Those are true for me. There are some other tricks that work for me as well.
Layer thin sheets of tissue paper on your clothes before you roll them. For some reason my clothes wrinkle even less than just being rolled.
Try stuffing your shoes with smaller items. Socks, underwear, belts, and t-shirts are some items that fit nicely in shoes. If you lay your shoes on their sides, you can also maximize space.