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These articles will help you.

https://www.gardeningknowhow.com/houseplants/pitcher-plants/growing-pitcher-plants.htm
https://www.gardeningknowhow.com/houseplants/pitcher-plants/pitcher-plant-has-no-pitchers.htm

DO NOT FEED THESE! EVER! If there are insects, then you can be sure that it is getting enough nutrients. The only reason you should use fertilizer is if it is a strict indoor plant, where there are no insects. I have seen many of these killed by fertilizing. They do not take nutrients through their roots at all.

Also, you should NEVER put any liquid in the pitcher. This will trick it, and it won't produce its own enzymes. The media it is planted in should never dry out. It is to remain moist at all times.

The pitchers will die off due to over-fertilization. This is what is happening here.

What you have is nepenthes alata. This is one of the more forgiving species.

I have many that are extremely rare, and are very difficult to care for. If you keep the humidity up, and NEVER put them into full sun, then they will be ok.

It would be helpful to have a picture of the pitcher plant. Some of them require different care. I have to assume that it is Nepenthes alata, though. This is the most common type, as it is most tolerant of different environments.

Now, the most common cause of no pitchers would be a lack of humidity and moisture in the peat moss mix. These should remain moist, making sure that the moss never dries out. It can help to spray the plant, daily, as well.

Here is an article that you will find helpful: https://www.gardeningknowhow.com/houseplants/pitcher-plants/growing-pitcher-plants.htm

No! Do not feed anything to the roots. They cannot take up nutrients this way. In fact, they are very picky about their planting mix. This should be Sphagnum moss and perlite. Nothing else. They can only take nutrients through their leaves and pitchers. You can spray them with a 1/4 strength orchid fertilizer, but it is best to let them get insects naturally. Most pitcher plants are very picky about their environment, and are a little more on the difficult side to grow.

This article will help you out a little more: https://www.gardeningknowhow.com/houseplants/pitcher-plants/growing-pitcher-plants.htm

A Pitcher Plant can be a challenging plant, but the fact that your plant looks healthy is a great sign.
This article will help you.
https://www.gardeningknowhow.com/houseplants/pitcher-plants/pitcher-plant-has-no-pitchers.htm

Can you give more information? Images of the entire plant would help.