Implement the formula in P2 or in F9...
If in P2...
=IFERROR(INDEX($E$9:$E$31,INDEX(MODE.MULT(IF(ISTEXT($E$9:$E$31),IF(ISNA(MATCH($E$9:$E$31,{"","unknown"},0)),MATCH($E$9:$E$31,$E$9:$E$31,0)))),ROWS($P$2:$P2))),"")
If in F9...
=IFERROR(INDEX($E$9:$E$31,INDEX(MODE.MULT(IF(ISTEXT($E$9:$E$31),IF(ISNA(MATCH($E$9:$E$31,{"","unknown"},0)),MATCH($E$9:$E$31,$E$9:$E$31,0)))),ROWS($F$9:$F2))),"")
If any other cell of your liking...
=IFERROR(INDEX($E$9:$E$31,INDEX(MODE.MULT(IF(ISTEXT($E$9:$E$31),IF(ISNA(MATCH($E$9:$E$31,{"","unknown"},0)),MATCH($E$9:$E$31,$E$9:$E$31,0)))),ROWS($1:1))),"")