Hi Sakthy, it sounds like you may be feeding your starter only once a day, which is causing the starter to rise and fall back to its starting level. Ideally when you're maintaining your starter at room temperature you want to feed it again when it's still ripe (at its peak rise, or just beginning to fall). Allowing the starter to fall significantly between feedings tends to result in sluggish yeast behavior. I would recommend giving your starter twice a day feedings (about 12 hours apart) and see if that improves its rising behavior. 

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