This is the plant's response to a lack of light, my friend! There's nothing critical at the tips, and there's nothing critical in the dying leaves at the bottom either! The biggest problem for your plant is the lack of quality lighting! You have a very small phosphorus deficiency in the plant, but you have neither a diary nor pH readings, no information to tell you for sure!
What I can say for certain is that the plant has developed poorly due to weak lighting. 👆
Good luck, buddy! ✊😇