There's also usually a plastic clip attached to the cable of your simple fitting, and a long screw into the ceiling somewhere above the wires - attach the clip to the screw.

Alternatively screw a thin piece of wood or plastic across the two holes we see in the photo (I assume they are threaded wall plugs), and then attach the clip to that.

Don't leave the light hanging off the electrical connections.

ps. don't cut the connectors off the in-ceiling wires, every time someone does that they get shorter and hard to reach! If it's a push fit connector, twisting while pulling usually works.