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You asked about a 'Kindle Fire'. Did you mean that literally? If so, that is a tablet and not an e-reader, and its a pretty old device.

The first thing you should do is try a different charger and a different cable. Cables in particular have very small wires that have to withstand repeated flexing, so their life expectancy is finite.

Next, you should try cleaning the charging port. Use a new, soft-bristle toothbrush - - - DRY, not wet - - - to carefully remove any accumulated dust or lint.

Has something dramatic happened to your Kindle - like getting soaked or dropped? If the device has been exposed to physical stress, it may have been damaged. In that case, you may need to start thinking about a replacement.

It is possible that you have reached the end of life on your battery (especially if it is a Kindle Fire tablet because that's a old device). Batteries in phones, tablets, and e-readers are designed for a certain number of charge-recharge cycles, and if you use your device a lot, you may have reached that limit. Apple is pretty good about publicizing the number of cycles they design for, but other manufacturers rarely talk about that parameter.

But in addition, the output of many (most) manufacturing processes is typically pretty good, but the fact is that sometimes individual products don't meet design expectations. Some are better than expected, and some are worse. Usually, this is a tiny fraction of the total output of the process, but if you happen to get one of those defective products, it's a big deal for you. It's possible, although unlikely, that your device came with a weak battery.

Amazon's official position is that the battery in their devices isn't replaceable, but it is possible to buy replacement batteries. In fact, there is one manufacturer of batteries who has even posted a YouTube video illustrating how to disassemble an Amazon tablet to replace the battery.

If all else fails, look into Amazon's trade in policy.