Your RHO must now play a card. Your partner should trust you to have the last 3 and capture the RHO's card, leaving 3 again. Then you may be able to capture LHO's card, and so on. Clearly it is good to establish an anchor, and to have cards on the table of ranks which your side controls. For this reason you should lead, or leave on the table, cards which you hold two or more of in your hand.
Coins are good to collect as well, and finally it does no harm to have the greater bulk of cards.
It is important to keep track of paired and unpaired cards. If all the captures were of single cards of equal rank, so that all the tricks consisted of pairs, then at the end the dealer's last card would match the last card on the table. If for example the dealer has a 7, it could be saved by keeping it until last and catching a 7 with it. As soon as someone captures more than one card at a time, this pattern is disrupted. If someone plays a king to capture a 7 and a 3, 3s, 7s and kings are now unpaired.