/w/ sound does not exist in many languages, for example, in Hindi, Russian, French, and Hebrew.
My native language was Russian, and it took me 6 months to strengthen my lip muscles in order to pronounce this sound correctly without thinking about it. In the past, I was substituting it with the /v/, and people could not understand me. As you can see from the examples below, the meaning of the word changes if the pronunciation of the /w/ sound is incorrect:
wet - vet, west - vest, whale - vale, wane - vain, worse -verse, wheel - veal.
If you want to achieve great results, practise the long /u:/ sound for three days, Lesson 2 and then /w/ sound, Lesson 25, in the apps:
You will feel your lip muscles getting used to the forward position. The practice will take 10-20 minutes a day.