The plant can grow up to 20 metres in the right conditions. If you want the plant to be big, bushy and epic, give it plenty of space. Repot regularly, as it grows too big for its current pot.
If you’d prefer a smaller plant, you can restrict the amount of room it has to grow and trim off leaves to keep it the shape you wish.
The long, silvery grey roots are part of the plant and are looking for extra moisture in the air. Leaving them is fine but if you don’t like them, trimming them off won’t cause the plant harm, as long as you are providing the roots in the soil with the moisture, they need by watering your monstera regularly.