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My screen is shattered and I plan on replacing it myself. What are some good upgrades to do while I have the laptop cracked open?

I would start off maxing the RAM to 16GB and look at replacing the HDD with a SSD which will add a lot of zip and if you’re lean on space boost its size up. MacBook Pro 13" Unibody Mid 2012 RAM ReplacementMacBook Pro 13" Unibody Mid 2012 Hard Drive Replacement You will also want to replace the drive cable as the original had its issues Your Hard Drive Cable Is A Ticking Time Bomb here’s the needed part MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable