Once you've got that done, you need to get some stuff. So first things first, get ALL of your SPECIAL stats to 10. The decreases from addiction don't have this effect, and I can't find anything else in the game that is treated the same way either. This is because when you take Chems/Alcohol with negative side effects, your stats treat it as a permanent decrease, even though it's only temporary. But did you know that you can get higher than that? Thanks to the duplication exploit with the 'You're SPECIAL' book and Dogmeat and a strange oversight with Chems and Alcohol, you can get some SPECIALS to around 13 or 14 or even higher. So the 'max' you can get a SPECIAL stat to in Fallout 4 is 10, or 11 if you're at 10 and pick up the corresponding Bobblehead. I take no credit for this, this belongs to a Reddit user by the name ' B0SS_Zombie'.