Challenge ?

DEFINE
MEASURE 'Ranking Exercise'[Total Sales] =
    SUM( 'Ranking Exercise'[Annual Car Sales] )
    
MEASURE 'Ranking Exercise'[Tenure Days] =
    // You need to create a column 'Ranking Exercise'[Days With Company]
    // that will equal Today() - RankingExercise[Date of Joining].
    // or you can replace the SUM below with:
    //    SUMX(
    //        'Ranking Exercise',
    //        TODAY() - 'Ranking Exercise'[Date of Joining]
    //    )
    SUM( 'Ranking Exercise'[Days With Company] )

MEASURE 'Ranking Exercise'[Employee Rank] =
IF( ISINSCOPE( 'Ranking Exercise'[FIRST_NAME] ),
    var vEmps =
        ALLSELECTED(
            'Ranking Exercise'[FIRST_NAME] 
        )
    var vEmpsWithRanks =
        ADDCOLUMNS(
            vEmps,
            "@EmpRank",
                CALCULATE(
                    RANKX(
                        vEmps,
                        [Total Sales],,
                        DESC
                    )                
                )
        )
    var vCurrentEmp = SELECTEDVALUE( 'Ranking Exercise'[FIRST_NAME] )
    var vCurrentEmpRank =
        MAXX(
            FILTER(
                vEmpsWithRanks,
                'Ranking Exercise'[FIRST_NAME] = vCurrentEmp
            ),
            [@EmpRank]
        )
    var vEmpsWithSameRank =
        FILTER(
            vEmpsWithRanks,
            [@EmpRank] = vCurrentEmpRank
        )
    var vThereAreOthersWithSameRank =
        COUNTROWS( vEmpsWithSameRank ) > 1
    var vResult =
        if( not vThereAreOthersWithSameRank,
            vCurrentEmpRank,
            
            // Rank these others with the current one
            // based on days with company where a
            // lower rank means shorter period with
            // the company.
            
            vCurrentEmpRank - 1 +
            RANKX(
                vEmpsWithSameRank,
                [Tenure Days],,
                ASC
            )
            
        )
    RETURN
        vResult
)
        
EVALUATE
    SUMMARIZECOLUMNS(
        'Ranking Exercise'[FIRST_NAME],
        "Total Sales", [Total Sales],
        "Tenure Days", [Tenure Days],
        "Employee Rank", [Employee Rank]
    )
ORDER BY
    [Employee Rank],
    [Total Sales] desc,
    [Tenure Days] desc

The code above is a DAX query that demonstrates how to construct a ranking measure that satisfies your requirements. Out of this, it's easy to just write the measure in PBI. Actually, it's already been written. It's 'Ranking Exercise'[Employee Rank]. You just have to adjust the names of some objects.