And at one point I had a fair bit more than that lol. But yeah arcanes and rivens, basically, with a bunch of little peripheral/passive incomes mixed in (like syndicate mods etc). Been doing 5x3+ since Energize was still selling for 3.5-4k. I've had a riven single riven sale that was more than half of that value by itself (an insane Vectis roll back in the day). More recently I made some serious bank (though a lot less than I could have) on the Acceltra craze like two months ago. But I burned out hard around that time and have been taking a break for the most part, just catching up on other stuff I enjoy.

Timing and luck is a big part of it (i.e. arcanes being worth double what they are now helped tremendously -- though they're still my most common source of income). Dogged persistence will carry a lot of the weight when luck fails, but the grind to get to that point gets to most people at some point no matter how they choose to go about it.