> If your employer is doing well, it is better to stay longer and get promoted from within. (Based on "Relatively good one" I'll assume this is the case.)

It’s almost always easier to get promoted by changing jobs where you control the narrative than try to go through the internal process. Besides that because of salary compression, you usually get paid less even after a promotion than someone coming in at that level. Yes this is true at FAANG size companies too.