reindex dataframe after sorting

[Clunk_Head]

It's a simple problem I'm sure, but I haven't found a solution.
I'm sorting a dataframe, then I need to reindex, starting from 1.
However, reindex undoes my previous sort.

>>> df
       MSRP        ASIN    Profit
0    $8.90   B07GRKMGCY  20254.70
1   $19.99   B0754FXQCM   9929.03
2   $16.49   B07QWQXW6J   8536.53
3  $239.95   B019GPCYDK      0.00
4   $18.99   B06XVV525Q  24283.00
5   $28.69   B079FM3MMD      0.00
>>> df.sort_values('Profit')
       MSRP        ASIN    Profit
3  $239.95   B019GPCYDK      0.00
5   $28.69   B079FM3MMD      0.00
2   $16.49   B07QWQXW6J   8536.53
1   $19.99   B0754FXQCM   9929.03
0    $8.90   B07GRKMGCY  20254.70
4   $18.99   B06XVV525Q  24283.00
>>> df.index = np.arange(1, len(df) + 1)
>>> df
       MSRP        ASIN    Profit
1    $8.90   B07GRKMGCY  20254.70
2   $19.99   B0754FXQCM   9929.03
3   $16.49   B07QWQXW6J   8536.53
4  $239.95   B019GPCYDK      0.00
5   $18.99   B06XVV525Q  24283.00
6   $28.69   B079FM3MMD      0.00

I expected this output instead:

       MSRP        ASIN    Profit
1  $239.95   B019GPCYDK      0.00
2   $28.69   B079FM3MMD      0.00
3   $16.49   B07QWQXW6J   8536.53
4   $19.99   B0754FXQCM   9929.03
5    $8.90   B07GRKMGCY  20254.70
6   $18.99   B06XVV525Q  24283.00