How do you make homemade stain for damaged wood?
I have listed some suggestions for you.
Coffee grounds make a great stain. You can find more about that here - https://www.everydayfamily.com/blog/diy-wood-stain-made-with-coffee-grounds/
You can make a grey stain using steel wool soaked in a jar of vinegar https://www.diypete.com/how-to-make-steel-wool-and-vinegar-stain/
You can also dilute latex paint in pastel colors to make a pickled wood finish.... https://www.youtube.com/watch?v=IiBPER0ADmQ blue and gray pickle is popular right now.
or you can do a Japanese burnt wood finish.... https://www.youtube.com/watch?v=cpBP1A2UrPE