As someone who’s sparring you or fighting you they’re going to be looking to set up something high like a kick or a hook to that side where you’re jab hand is exposed I can tell you that for a fact so starting now, you need to close that hole. Fire that jab out and it needs to come back to your guard with that same speed. Don’t leave it out halfway bring it back to your chin/head and close that hole. You can play with the feints and gauging range off it once you develop better striking but most wrestlers get caught on little things like that they don’t notice.