How can I change my deck to incorporate synchros?

You could try running Debris Dragon, Magna Drago, or Flamvell Guard. If you run Flamvell Guard, run more than one, and also run One for One to bring it out faster. Also, you could run 2 of Krebons and an Emergency Teleport. Another option is to run just a Plaguespreader Zombie. I hope this helps!