What minecraft mod(s) should I get?

I have already defeated the ender dragon and I currently have the optifine mod and the better sprinting mod so I am looking for another mod. I was thinking of crazycraft mod pack but I am not sure whether to get it or not. I play minecraft on my dad's laptop so I can't go on much but if I ask he will help me put any mod on as long as it's appropriate.

Please answer

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