The BladeForums.com 2024 Traditional Knife is ready to order! See this thread for details:
https://www.bladeforums.com/threads/bladeforums-2024-traditional-knife.2003187/
Price is $300 $250 ea (shipped within CONUS). If you live outside the US, I will contact you after your order for extra shipping charges.
Order here: https://www.bladeforums.com/help/2024-traditional/ - Order as many as you like, we have plenty.
Not to be flippant, but the best way to make the most money in knifemaking is to make a lot of knifes that your customer base will buy.
If you are an unknown, that may well be many low price but good quality knives. If you are a famous maker, it may be two or three high grade collectible knives a year.
I hope this doesn't aggravate people, and I know it doesn't directly answer the question, BUT...
you left out:
3. licensing designs to manufacturers
4. teaching
and
5. publishing
for better and for worse, there's more money attached to thinking-work than to making-work in every industry I can think of, knives included.