IF THEN statement in a symbol column

Fairly new to smartsheet, so not sure if I'm doing something wrong.

I have a priority column in my To Do sheet which is a symbol column (High, Medium, Low).  I would like to create an IF statement that will automatically change the priority to "Low" once the task is completed (doing this for the purposes of a report I am running).

I created the forumula below:

=IF([Done]1=1,"Low")

This formula works fine and I can paste it in all the cells of the column.  The problem is when I manually enter a priority for a task, e.g. "High"  The formula is then removed and when the Done box is checked the priority remains "High." So it is essentially useless.

 

Any help?

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