A distance-management approach from the maai (spacing) tradition - the fight is decided at the moment they cross your threshold, not at the finish.
Keep striking distance against a shooter without giving up your posture.
A grappler wins by closing distance. Make the distance expensive. Keep a long lead hand, fingers open and elbow soft, in the space they must pass through to reach you.
When they level-change, your hips travel backward while your frame stays forward. Their shoulders meet your palm before their hands meet your hips.
Angle off at 45°, never retreat straight. As they reset, meet their entry with a lead-hand strike or a knee. The fight is decided in the two feet before the clinch, not inside it.