When it comes to expressing the idea of taking an interest in or paying attention to a particular matter, there are a number of synonyms for the phrase "concern oneself with." Some of these include "focus on," "attend to," "give heed to," "deal with," "be involved in," "take care of," "give attention to," and "address." Each of these phrases can be used in a variety of contexts, whether in personal relationships, work situations, or social settings. Whether one wants to communicate a sense of urgency or a more casual interest, there are a range of options available in the English language to convey this idea effectively.