Thanks for all the Cake Day greetings! I'm traveling, so won't have much time to respond (I'll be back in a few days). In the meanwhile, here's a short train that uses different types of GAs for each wagon. In places where you're more likely to be stuck, there's an option to skip a wagon.

This is the order of giveaways. The ones that aren't in bold can be skipped.

Invite Only → SGTools → Wishlist-based → Public group → Private groups → Jigidi puzzle (easy) → Whitelist → Itstoohard puzzle (easy) → ESGST-based → another SGTools → Discord linked → Public → Hidden → Bump :-)

I included notes with information about how to enter some of the less self-explanatory giveaways (e.g. SGTools, Private groups, Public group, Whitelist, ESGST, Discord, Hidden).

Included games in alphabetical order (not the order of the train):

Good luck! :-)

A few key drops types are here
The key drops are in this comment