maybe from singing and listening Cantonese song

There’re 6 tones in Cantonese, just remember one sentence 「三碗細牛腩麵」（please check the pronunciation online , this sentence contains words with 6tones). Remember this sentence and try to repeat as much as you can. Next time , when you try to speak a word in Cantonese, ask yourself which tone is it first,and check the dictionary for double checking. Hope that can help you . Add oil加油💪

Memorize the basic 6 tones. and for each sound, practice the 6 tones. Get used to paying attention to the 6 tones of each sound. You will be fine then.