iTalki isn't specifically designed for learning Chinese, but it's still one of the most convenient and probably also one of the cheapest way to find people to practice Chinese with. Sure, you can find language exchanges for free, but if you want to pay some money to focus just on Chinese, you could check out iTalki. Naturally, the problem is that the quality of the help you receive will vary enormously, so don't hesitate to switch between different native speakers. This is also great to get an opportunity to try similar content with different speakers and see how well people understand you and how well you understand them!