Well my few tips I can give are as follows:
~ Make 2 mob towers, 1 2 blocks high with water so enderman dont spawn, and use witch water in that one. The second one make three tall with conveyor belts so enderman spawn, cause when the enderman touch witch water, they tend to teleport all over the place.
~ Auto Farms are a wonderful thing
~ Automation for sifting different things not just sand, dust and gravel
~ Every chance you get, quest quest quest, turn em all in if you have the stuff.
~ Blood Magic, because I havent tried it, but people have told me it helps out alot.
I cant think of much more off the top of my head other then automation as much as you can, chunk loaders incase your too far, and to do as many quests as you can.