Perhaps as a note, property in Singapore costs (unfortunately) seven figures and is financed by a local bank. Could really use the extra 50k but we'll see. Maybe it's simply time to sell the apartment.
The apartment for sale is currently a very good idea. Why wait for the bubble to burst? Then you also need to take on less debt in Singapore. 46m2 * 3000 euros =138k Is the apartment rented out long-term? How high is the profit there?