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I'd also suggest for you to include a TF2 key as option since a lot more people have those and you can then use that key to buy some of the mentioned DLCs with 1 key probably. Like Darkness Among Us, Demise, Descend, Portrait, Chains of Hate. Just a suggestion. Good luck!
DOOM Eternal
Fallout 76
4 x TF2
or ( both for 7 x TF2 )