When it comes to making connections, there are various ways to describe it beyond just "complete the connection." Depending on the context, you could "establish" a connection, "form" a connection, "link" something up, "join" two things together, or "fuse" them. Additionally, you could "buttress" a connection, "strengthen" it, "secure" it, or even "solidify" it. The way you describe making a connection largely depends on what exactly is being connected, how important the connection is, and the industry or field being worked in. Nevertheless, having a diverse vocabulary when it comes to describing connections can be helpful in effectively communicating with others.