I pretty much just went crazy with the egg shells and added a bit more mulch to balance it out. My parents eat eggs every morning and just put them in an uncovered container to dry out.
I didn't think to treat the egg shells but I will keep that in mind for the next time. All I really did was spend some time with my pestle and mortor in the sun and grind them down.
Over the last couple years, I just sort of threw all the trimmings back into the garden, especially the tomato plants. Then I just started throwing all my food scraps in there because why not. I'm sure all the bugs appreciate it and their poop is good for the plants too.
I also covered the garden bed with leaves last year to protect the soil, and when that breaks down it should add more nutrients to the soil too. Trying to copy what a forest does with their leaves for the winter.