Congrats, and thank you!
Sure, let me know how it goes if you do :)
I won't give away how to find the endings, but so far you're missing endings 5, 12 & 13. Ending 5 is in the Pres Tubbo storyline. Endings 12-13 are found in the Pres Quackity storyline, if you prevent war from breaking out in chapter 3.
Also remember that for a few endings there are more than one way to find them, so watch out for those!
Some secret events only happen by random chance so you have to play the game enough times to find them all. Right now there are not many of them and none will affect the story.
There are 2 secret endings that are meant to be 'hidden' or hard to get. I can see if I can make them easier to find but I think the challenge is the fun bit