I can see every service cars,cones,stairs etc. around the plane from gsx
Those are NOT from GSX, because the one from GSX can't appear unless you call them from the GSX menu. Those are the default Ground vehicles from the sim, which have their model replaced by GSX so, they "look" like GSX, but they are not GSX vehicles and they will be removed and replaced by GSX vehicles *after* you call GSX.
As explained in so many threads, if you see the loading image for a long time, the first thing you need to check if it's the Couatl engine is running, by looking at its icon in the taskbar notification area. You must hover with the mouse on it because, even if you see the icon, if the program crashed for some reason, you won't know unless you hover the icon, which will eventually disappear if the program is not running anymore.
If the Couatl engine is not running, the first thing you need to check is if it starts manually instead, using its Desktop icon called "Start Couatl for GSX MSFS".
If it starts manually, but not automatically from the sim, it's a whole completely different troubleshooting process then.