Do some reading, looking at every critter in safari books, it’s kind of a personal thing. Some hunters must deer hunt every fall, personally, I like a one of everything type of approach. I love the variety of animals, and going to different places.
I would check with some Safari groups that you feel confident with, and plan a couple multi species hunts. They are cost effective, and get you lots of time behind the gun. If you complete your list, with a couple days to spare, spend some driving time looking for something that you just must have! I acquired my Springbok while looking for a big impala. You never know what may present itself