Your surface is probably fine for now. If you want to "upgrade" it will depends on what kind of games you play and your play style. So if you're playing fornite like you're on crack and need to look a million different directions a second, you'll probably want a "fast" pad. Or if you wan't more precision when holding angles in CS you'll probably want a more "control" focused pad.
Endgame Gear MPC mats are pretty good mix of speed and control. Really consistent in their feel, last a long time, don't feel sticky or rubbery after a bit of sweat, but it has a rough texture that might not be for everyone.
Glorious pads are trash. Wear out quickly and you can really start feeling the drag on your mouse after a little sweat build up, which is made worse by humidity levels in the atmosphere.
All those steelseries or logitech pads are overpriced garbage.
Basically Endgame Gear pads are the only ones worth buying if you want an "upgrade", at least that are available to buy on ocuk. If you just want a functional pad, then anything will do as long as price and size suits you.