You just need to find the right amount of fast acting carbs (juice, glucose tabs, what-have-you, the amount should be about the same) to treat your lows. It really shouldn’t matter how low you are, you should be taking enough sugar to get your BS up about 50 points. If you are really low or really crashing, you made need to treat again after about 10-20 minutes, depending on what your BS is at that point. For me personally, about 15 carbs brings my lows up about 50 points, but everyone is different. Make sure you are measuring your juice and play with different carb amounts to see what works for you.
Also sounds like you may need to adjust your overnight basals (if on a pump) and your dinner carb-to-insulin ratio. Talk to your endo if you are not comfortable playing around with these yourself!
I have changed my high alerts to 130 during the day and 120 overnight to help keep me more in range, especially overnight when I am not checking constantly. If you find your CGM is consistently reading lower than what you actually are, you may want to set your alarm to 10 or 20 points lower than what you see as an acceptable level just in case!
Hope this helps!