I'm gonna bet that the holes are being made by a visitor. I wouldn't expect to find it right there on the plant all the time... maybe set a trap! Or, wash the plant with a mild soap and water solution, or dust it with diatomaceous earth (all safe means by which to address some parasite problems, but by no means all).
The malformed leaves are for someone more experienced. The slow growth is relative, I'm learning that many factors go into this, among them available nutrients and minerals (micronutrients), pH (absorption of a given nutrient takes place best at certain pH levels), temperature, humidity, and genetics.
Not growing anymore, but not dying... so... they're just kind of "hanging on"? Indoors or out? Light (PAR -- photosynthetically active radiation, which is measured in lumens and Kelvin ratings or nanometer on the spectrum), food, soil/medium -- that's what the plants need, and none in too great or too little a quantity. If under artificial light, do you have the right combination of lights? If outdoors then that's not the problem, because all lighting is mimicking the sun, right?