“It’s gotta end sometime!”
It’s your ending just make it good. The end of your screenplay should leave a lasting impression on your audience. It’s up to you what that impression should be. Do you want all you’re loose ends tied up in a nice little bow, or do you want to leave the finality up to your audience’s discretion? Whatever you decide just make sure it is satisfactory and appropriate to the screenplay as a whole. If you have several ideas and you cant decide, write all the separate endings then sleep on it or have them critiqued!