If you want to get to that 9 figure mark, there are two very important things to consider. The first, you need to level ALL of your crafters and gatherers. And not just level, you need to max out their gear, obtain the mastercraft and folklore books and anything else you need to be self sufficient. This is for number two, which is to spend as little gil as possible. You can't make gil if you're spending it, so spend wisely when you do. Getting to 9 figures also requires the currency of time, so you want to avoid mistakes like paying the cost for a teleport when just going to the MB would be cheaper. You have to do a lot of time vs cost evaluations to make the smartest move.

After that, and I am sure are already aware of the DoL version of PvP: The market boards.

Another thing to keep in mind when it comes to time vs gil costs is a lot of the items that sale for very high on the MB are usually a major time investment, or being totally blessed by RNGesus. I find it best to home in on highly marketable, lower cost selling items that sell quickly. You probably can sell nothing but soot black dye and make more money by the time a primal weapon will sell. That's just an example just to give you an idea before you decide to spend a schite load of time crafting items that sell for 1 mil+. Those very same items will also have a moderate amount of competition from players thinking just like you, and it may eventually get undercut well below the time you invested.

For me, I don't know if I will ever get past the 9 figure mark. I know I could easily if I invested more time into solely making gil, but I prefer to just sustain a comfortable amount so I can make major purchases without breaking my back like I did with when I purchased my house. And the closer I get to that mark, the more likely I am to make a major purchase to knock it back down.