This is a prelude-like movement. It is not strictly necessary to adhere to the metronome. Pay attention to the cadenza sections. These cadenza passages serve as divisions, and it is appropriate to increase the tension as you approach them.

• First section: up to the first beat of measure 18
• Second section: up to the first beat of measure 36
• Third section: up to the first beat of measure 47

This division is merely an example; you may divide it more finely or more broadly. However, establishing such divisions provides direction and facilitates the determination of dynamics.

The opening tutti section spans measures 1-4, and this material reappears in a descending form in measures 36-40. Therefore, it could naturally conclude here; however, from measure 40 to 47, further improvisatory sections emerge, which are highly supplementary, so it is not unnatural to increase the tempo further.