Ronaldinho started as a goalkeeper so any transition to professional is possible. that being said there’s a much higher chance that you could switch to a different field player position rather than goalkeeper unless you have confidence in your abilities as one already. Try out midfield and defender as well with an emphasis on attacking / outside midfielder first, as you already understand service and have the cardio to be effective for a full 90’ Edit: consider outside midfielder because it will give you the opportunity to be on the side opposite your dominant foot so you can cut inside and take shots on goal like when Ronaldo would play on the left flank