Congrats on your approval @ccpat! GS Bank's version of Apple Card is a little over two years old now, so data points may have shifted slightly. I believe they may have softened just a little bit. Still, Moderate-to-heavy use as a percentage of existing credit limit has seemed to yield much more success. Early-on, it appeared spending at least 25% minimum of existing CL (so $500 in your case) over a few months prior to a request was needed to get even a smaller increase. Of course, as CL grows, the more spend they may want to see before an increase. They aren't cards to grow every six months sitting in the sock drawer. Larger spending seemed to give much larger increases. Although they definitely like to see spend, they are also more generous as you increase it. On the high end, it appears they have capped out at about $10K CLIs after you pass the $10K - $15K limit mark with heavy spend.
In some cases, I believe it may be difficult to get sufficient spend for growth if you only use the card for higher-paying Apple Pay categories. In my case, I decided to also swipe the physical card (or use the card number online) and accept the lower 1% rewards to get better growth.
