The primary point of concern is the tempo. For instance, setting the tempo to approximately dotted eighth note = 140 makes the music considerably clearer and prevents it from becoming drawn out. However, when considering the character of B-flat major, it tends to evoke a slight sense of 'urgency' or 'restlessness.' Please consider other works by Bach in B-flat major, such as the Inventions, Sinfonias, The Well-Tempered Clavier Book I, and Partitas. You will likely discern that the prevailing image is one of beautiful music flowing within a dignified, serene atmosphere, rather than an oppressive expression.

While the B-flat major Prelude from The Well-Tempered Clavier Book I is typically performed at a brisk tempo, this particular prelude diverges from that sprightly character. Considering comprehensively that this prelude evokes an image of comfortable horizontal flow, and is not music that emphasizes vertical rhythmic articulation (marking beats), it is my assessment that a slower tempo would better align with the piece's intended character.

Please attempt to perform it at a slower tempo, approximately dotted eighth note = 94. If allowed to progress melodically rather than briskly, this tempo will likely feel more fitting.