The phrase "be of value" can be replaced with various synonyms in order to convey the same message while adding some variety and sophistication to the language used. Other expressions that can be used instead of this phrase include "have merit," "serve a purpose," "be beneficial," "be advantageous," "be helpful," "be useful," "be meaningful," "be important," "be relevant," "be worthwhile," and so on. These synonyms can be interchanged depending on the context and tone of the communication, but they all essentially mean the same thing - something is valuable and provides some sort of benefit or usefulness.