To practice sequences I suggest this:
Keep the same sequence
– Chord with long notes
– Add phrase
– Add a figuration of long and short values
– Add a figuration of short values
– Imitate the figuration (question/answer)
– End with long chords trying to add passing chords or dissonances (suspensions)
– Repeat the same in the same key
– Practice each item separately if needed
– Try another key after you are confident in a minor or c major