I'm sorry to hear that you had a negative experience with your Poco X3 Pro. It's always frustrating when a device fails after only a short period of time, especially when you've been a loyal Xiaomi user for a long time.
However, it's worth noting that no device is immune to hardware failures, and unfortunately, these things can sometimes happen. It's also worth noting that Xiaomi offers a one-year warranty on their devices, so if your Poco X3 Pro failed within that period, you may be eligible for a replacement or repair.
That being said, if you've decided that you no longer want to use Xiaomi devices, there are plenty of other options available on the market. It's important to do your research before making a purchase to ensure that you're getting a device that meets your needs and is reliable.
I hope this helps, and I wish you the best of luck in finding a new phone that you'll be happy with!