Adjectives (rather than adverbs) are used with certain verbs, as in it smells amazing. Other verbs followed by an adjective are “be”, “seem”, “appear”, “look”, “sound”, “taste” and “feel”. If you do something on your own, you do it without any help. “By yourself” can be used in the same way. If you make yourself scarce, you leave and stay away for a time to avoid something unpleasant.
Though is used when adding information that makes the previous statement less strong or important. A “glutton” is a person who eats too much. A glutton for punishment enjoys doing unpleasant tasks.