Q.prayer plant
I bought a prayer plant and was really excited to see it grow and close its leaves. I’ve had it around 4 months and it hasn’t done anything. It doesn’t roll up its leaves, it doesn’t seem to be growing and it seems quite limp. I’m sure I’m not under or over watering it! I’ve tried it in different locations but nothing seems to work. I was so looking forward to enjoying this beautiful plant!! Please help!! Thank you.

Did you put the plant in a place of bright, indirect sunlight? Prayer plants also require high humidity - did you mist it daily with warm water or place a container of water near it?
The soil of a prayer plant should be kept evenly moist. Touch the soil with your finger - it is damp/soggy? - if so, you have over-watered it and you may want to consider re-potting it in fresh soil. Is the soil bone dry? Then you are not watering it enough. It is recommended to water the soil when the top inch of the prayer plant's soil starts to dry out.
For more information on the above and additional guidelines on the care of prayer plants, please check out the following article:
https://www.gardeningknowhow.com/houseplants/prayer-plant/maranta-prayer-plant-peacock-plant.htm
Are the leaves yellowing? If so, you will want to review this article:
https://www.gardeningknowhow.com/houseplants/prayer-plant/yellow-prayer-plant-leaves.htm