It’s particularly challenging for a native French speaker to say the English word “thorough” for a couple of reasons. The -th sound is made by placing your tongue on the bottom of your top teeth and blowing air around it. It’s a sound similar to air escaping from a ballon. The English -r sound is quite different from the French -r sound. In French, the -r is made in the throat, but an English -r is formed in the front of the mouth. The -ough sounds like “l’eau”.
I recommend that you look up some videos about how to make the -th and English -r sounds and practice them separately. Once you start to train your mouth to make these sounds try them together. Until you’re confident just use the English word “complete”, which has a very similar pronunciation and meaning to the French “complet”.
@brahimnajah94 you’re getting closer and closer. trulyalie’s pronunciation is good with the “w” sound. here’s an audio clip explanation for another practice, doing ooo and euuu in the word “throughout”