At this point, it is far too late to make a "return of excess contributions." That had to be done before April 15, 2019. (I believe there is a provision to remove the excess in the following year, but that would only extend the deadline to April 15, 2020. Also, I don't fully understand that provision and you would need help from another expert.)
That excess must remain in your account and will accrue a 6% penalty every year until your account is spent down. (The penalty is 6% of the excess contribution, or 6% of the account balance on December 31, whichever is smaller.) If your penalty is only $16, then I guess your excess contribution is just $266? That's not too bad. $16 per year is just the equivalent of a slightly larger than normal account maintenance fee. But, you are stuck with it until the end.
