The phrase "be full of" refers to a state of being completely filled or overwhelmed by something. However, there are several synonyms for this phrase that can be used to add variety and richness to one's vocabulary. Some alternatives for "be full of" include: brimming with, bursting with, packed with, teeming with, loaded with, abounding in, suffused with, inundated with, rife with, and awash with. By using different synonyms, one can convey a variety of emotions and shades of meaning, making their writing more interesting and engaging. So, next time instead of saying "I'm full of joy", try "I'm brimming with joy" or "My heart is suffused with joy".