I'm sailing on Brilliance in June 2025, so I was trying to figure out what the most recent refurbishment would be at that time. However, I think Brilliance is scheduled for the following during the April/May timeframe:
2025 Apr 12: 15 days, one-way from Miami to Portsmouth UK
2025 May 13: 8 days, one-way from Southampton to Barcelona
2025 May 21: 9 days, one-way from Barcelona to Piraeus-Athens