Try to have fun.
This is the first and most important of the unspoken rules of gaming, which takes precedence over and allows for the modification of all of the other unspoken rules. Gaming is a hobby; games are meant to be fun. “Fun” can mean different things to different people, but if a game isn’t fun for your group, then you shouldn’t play it, or you should alter things as needed until you are having a good time. But better make sure that the other players are all on board with your alterations!