Hi charafRef,
Please try if this will work for you.
SortByColumns(Filter(ProjectEmail,StartsWith(Status.Value,Dropdown1.Selected.Value)&&Dropdown2.Selected.Value in Title),"Title",If(SortDescending1,Descending,Ascending))
In this function, I have two Dropdown controls, Dropdown1 for a Choice column, Dropdown2 for a Text column.
Please modify the function according to your scenario.
If you need more help, please feel free post back.
Best regards,
Mabel Mao