Did God sin in Jonah 3:10? No, absolutely not! Therefore because God is holy and repented, "repent of sins" is unbiblical.

Exalt the LORD our God, and worship at his holy hill; For the LORD our God is holy.
Psalm 99:9 KJB

in hope of eternal life, which God, that cannot lie, promised before the world began;
Titus 1:2 KJB

Since God cannot and does not lie or sin, therefore he cannot "repent of sins" and thus the common phrase of "repent of your sins" is biblically incorrect, because repenting is about turning from unbelief to believing on the risen Lord Jesus alone!

@RepentOfSinsExamined