I like stoicism, is was the first philosophy that resonated with me, and still influences my thoughts. But if there is one criticism of stoic philosophy is is that it ignores the effect you have on others.

As you say, doing the right thing is an important aspect, but if something you do hurts someone else stoicism doesn't have a lot to say about it. It is a little self focused for my liking.

Optimistic nihilism folds the best parts of stocism in and adds responsibility for your actions, i.e. if it is important to you not to be thought of as a prick, then treating people well naturally falls from that. It you do something to hurt someone, it is your responsibility to make it right.