With a high level giga and another for mate boost, you can melt through any titan. You get around 40 thousand dino xp per kill so gethat 2 experienced players on gigas and get the rest of your tribe to sit near on the dinos you want to level. If you can stop attacking when it gets bloody and let the lower level players finish it then they will level up super fast.
You hit it with cannons on a quetzal. Go for it’s head. It’s torpor won’t drain either so take your time. They can’t eat just stuff a platform saddle on the titan once KO’ed. You use daedons to heal it when it’s food level is low.
If you try taming these guys, tame a Quetzal first and equip it with a platform saddle. Then, put 2 storage boxes on it and a cannon. Make sure you make LOTS of cannon balls. Then, shoot the titan in the head.