Pronouncing correctly defines the level of your English to others, especially native speakers. We need to consider several aspects and improve in each one of them: Linking, Intonation, Stress, Vowels and Consonant sounds, etc.
There are English students who develop good levels of fluency, but it’s hard for others to understand what they say and this is why we must try to speak fluently, but more important, to speak clearly.
Engaging in practices such as repetition, modeling sounds, imitating native speakers and such, can really make the difference for English to be comprehended.
I chose this simple video because it is one of multiple tools that you can use in your goal to become a proficient speaker. Please click on the link and make the best out of it.