When it comes to synonyms for the phrase "do by," there are a number of options to choose from. Some of the alternatives that you might consider using include "treat," "behave," "conduct oneself," "act towards," and "deal with." Each of these words can be used in a variety of different contexts to convey similar meanings as the phrase "do by." Whether you are writing a formal piece of prose or simply trying to express yourself more clearly in casual conversation, having access to a range of synonyms such as these can help you to communicate more effectively and to get your point across with greater precision and clarity.