A one pound loss is a lot better than the rest of the population is doing, not to mention you are probably getting healthier and reducing your risk of western disease by eating LCHF. If you want to give up on your long term health because your weight loss has slowed, the choice is yours. I encourage you to look at all the benefits before you say keto isn’t working any more. The special occasion will come and go but you are stuck with your health for the rest of your life.
Consider time restricted eating (16:8), OMAD, cutting artificial sweeteners, reducing dairy, nuts and stop snacking if you are. Any one or all of these might encourage your scale to start moving. Stress can also prevent weight loss so try to stop putting so much pressure on yourself. 