The word "more sermonizing" can be replaced with a number of synonyms that have similar meanings. For instance, one of the synonyms for this expression is "preaching." This means that instead of using "more sermonizing," you can say "more preaching." Similarly, you could use words such as "lecturing," "admonishing," "moralizing," or "harping on." All these words convey a similar meaning as sermonizing, a word which implies giving a speech or talk with a preachy tone. Whatever alternative you use, ensure it is suitable for your context and brings out the desired effect in your communication.