"How to say 'practice doing something' in English?"
You can say "practice doing something" in English as "practise doing something". However, it is more common and natural to use the verb "practice" in this context, so you might hear people saying "practice doing something" less often.
For example, if someone asks you, "What are some good ways to practice speaking English?", you could answer them by saying, "Practicing speaking English regularly is a great way to improve. You could try having conversations with native speakers, watching English movies or TV shows, or even practicing with language learning apps."