Depends on which shine you're talking about.
If you applied polish over the stock surface, then just 2000 grit should work.
If it's has oil shine on the ball from use, you need to clean it off with a good strong cleaner, like Clean and Dull or Hook-it. Then sand it with 2000 grit, if it doesn't have too many games.
If it has a bunch of games, then the 2000 grit surface might be compromised and you should do the the 500/2000 sequence completely over again to do a thorough refresh.
Most balls need a through refresh every 20 - 50 games or so. Oil suckers like the Revenge may need an oil extraction around that 50 game mark. Most times you should do one when the ball reaction changes significantly. It could be 30 games or it could be 75 games. Depends on the usual suspects.
"None are so blind as those who will not see."