Dummy goes down - count your losers none in spades - 2 in hearts 1 in diamonds and 1 in clubs.
Win the lead as soon as you can. Two rounds of trumps and lead a low diamond from your dummy hand toward the QD.Draw the last trump card out. Then lead a low diamond from declarer's hand planning to finesse against the JD being in West's hand, cover whatever west plays, east wins with the AD. Cover the diamond return with 10D - play KC and QC discarding hearts - lead a low heart to KH losing to the AH - the rest of the tricks are yours.
Finding your optimum contract can be more difficult when both parties are bidding