When referring to something that is already mentioned or present, "with this" is a commonly used phrase. However, there are many synonyms that can be used in its place. "Alongside this" or "in addition to this" are great options when discussing multiple ideas or items. "Furthermore" or "moreover" are also strong choices if you want to add onto a point previously made. "In this same vein" or "in the same way" may be used to draw a comparison to something already mentioned. Whether you're writing an essay or having a conversation, having a variety of synonyms for "with this" at your disposal can help keep your language fresh and engaging.