Many times over the years I have had a plant now and then that looked deformed while small or seemed like the runt that would never grow … and then one day they took off faster than Wile E. Coyote with his butt glue-gunned to an Acme rocket and they ended up my best plant.
Never give up on a plant to soon. As long as it is not diseased and likely to spread it to other plants when you are ready to give up on it, give it one more week. Sometimes they never turn into much but many will surprise you often enough that it is worth doing a few things different or extra if needed due to their early difference and giving them more time to come around.