Try this quick tip to get your sound LOUDER and EASIER: Imagine you are squeezing two oranges underneath your armpits. You should feel some engagement in your pectorals (in front) and lats (in back). Sing a line of a song with and without this engagement.
Why this works:
A lot of singing deals with displacing tension, so that your larynx and vocal folds are free to move as needed. By engaging these lower muscles you are deactivating some of the laryngeal musculature which allows for more freedom in the airways. This trick works especially well for belting but can be useful for other styles!