Through this medium is a phrase often used to describe the way in which a message is conveyed or communicated. However, there are several other synonyms that can be used to express a similar idea. For instance, the phrase "by means of" can be substituted for through this medium. Alternatively, one might use the phrase "via this platform" to convey the same meaning. Other options include "using this channel" and "through this conduit." Ultimately, the synonym chosen depends on the context of the message and the tone intended by the speaker or writer. Regardless, all of these phrases serve to convey the idea of communication through a particular medium.