Power cycle your modem and router. This clears the cache and can reset a "stuck" routing path to your ISP.
If you tell me what you're trying to do, I can give you more specific advice: (What game and region?) Video conferencing (Zoom, Teams, or something else?) General web browsing (Is it just certain sites?) fast download and upload but high ping
💡 If you are already wired or cannot switch, try these steps: Power cycle your modem and router
When you have high ping despite fast speeds, your "highway" is wide enough to carry everything, but the individual packets of data are taking too long to travel back and forth. Common Causes of High Ping on Fast Connections Common Causes of High Ping on Fast Connections
This is the speed limit and the distance. Even on an eight-lane highway, if the destination is 500 miles away or there are constant stoplights, it will take a long time for a single car to make a round trip.