First you need to get this map✩ Beatmap: https://osu.ppy.sh/b/207692&m=0
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◊ You can find some map like this in YT or ask your friend to practice your skill
◊ NEXT
Just practice the stream ! Stream skill is hard so you just need spend more time to practice it 
◊ The Tips to train it here that you should practice stream on LOW BPM
the HIGH BPMI Hope you success
Example Hand tap when Streaming