It seems that you filed and served a complaint for unlawful detention (CRS 13-40- 10) asking that you be restored to the possession of your rental property. Also that you omitted to include in your pleading a count seeking monetary relief, that is a judgment for unpaid rent. Nor was your complaint timely amended to include such a count and prayer for relief as would have been permitted upon good cause being shown and timely filed. (See: CRS 13-40-113(2)

It further appears that a Writ of Restitution has been issued indicating that the relief asked was granted concluding the lawsuit.

It must necessarily follow that you have waived your right to seek a money judgment against the former tenant. In short it is too late. You don't get a second chance at the same defendant. You cannot force the defendant to defend against additional claims that arise out of the same transaction or series of transactions that formed the basis for the original lawsuit.

The law does not permit the splitting causes of action and trying lawsuits piecemeal. In such case the first action may be pleaded in abatement of the subsequent suit. (Vol. 1 C. J. S. Section 102 p. 1306)