I live with my SO, his parents and his sister. What can I do to show appreciation to them?

I already clean (half of my day off work is spent cleaning and doing laundry) and I put the table, help with dinner and other little things as needed. I also buy some groceries, mostly things I use or things that are needed like trash bags or napkins because they don't want me to pay rent.

What other things could I do?

Also, what behavior should I avoid 100%??

I'm asking because I get along well with his parents but I'm always worried that I could do something wrong.

I know I've done things they disliked such as leaving the bathroom wet after the shower and making too much noise in the morning/at night. I corrected those issues but I'm wondering what else I could be doing wrong that I don't know of.