Anyone who at least once heard French speech, paid attention to the fact that the French pronounce the letter "r" ("r") differently than we do. Moreover, if a Soviet child in childhood pronounced a grating "r", then his parents urgently took him to a speech therapist - to correct the defect. And for those who learn French, the situation is exactly the opposite, they must learn to "lisp".
In schools, teachers usually invite children to practice the pronunciation of a letter by picking up a mirror. And they explain: "Press the middle part of the tongue close to the middle of the hard palate, and touch the lower teeth with the tip of the tongue." Few people find this explanation helpful, but try this method first (you need a mirror so you can see exactly what your language is doing). If that doesn't work, try to pronounce the French "r" like the Ukrainian "g".
Many people get the results they want by listening and imitating. For example, you can take French announcers (find French radio on the internet) or singers as examples. Edith Piaf's songs, such as the famous “Non, Je ne regrette rien”, are a great example. Or choose songs by Mireille Mathieu, for example, "La vie en rose". It is believed that these singers are even too grazing, but during training, imitating them, you will achieve the desired result.
Practice pronouncing French sayings that contain a lot of growling words. For example, “Mon père est maire, mon frère est masseur” (“My father is the mayor, my brother is a masseur”) or “Dans la gendarmerie, quand un gendarme rit, tous les gendarmes rient dans la gendarmerie” (“In the gendarmerie, when the gendarme laughs, all the gendarmes laugh in the gendarmerie "). Here, of course, it is not the meaning that is important, but the combination of the letter "r" with others. Try to pronounce the sayings faster and faster each time, but do not forget that "p" should be "burr".