Not voting does not tell the system their authority is meaningless. Not voting is just not voting.

For over half Americans, voting for president is pointless, voting blue in a red state or red in a blue state doesn’t do anything in the winner take all states. But, voting for president means you’re also there to vote local, which by far more important and impactful on your day to day life

Who the president is is largely inconsequential to your day to day life. The legislature is where you need to focus.