You either have to play defensively yourself with optionselect zone parries, or you must build up better mixups. In theory, 400 ms lights are not reactable, you have three of them. That is the main pressure, once you started to condition opponents into parrying them you can start to throw out heavies and guardbreak softfeints. You can also dodge out from heavies as softfeint, you might use some heavy into dodge or dodge attack mixups too. The mixup game is all you have in this situation.