I booked a flight with an E+ voucher upgrade, and was notified the outbound leg was moved to about 4 hours earlier, which makes it potentially impossible for me to make on time that day. I'd rather move the flight to one or two days later, but under a regular change that would both cost a lot (change fee, difference in fare) and wouldn't allow me to reuse the voucher (there's zero availability on my route anywhere near these dates).

Do I have any special options due to the fact that the moving forward of the flight time was imposed on me? E.g. is there a particular path to get an equivalent flight (cabin) for free /cheap and regardless of the way the flight was booked, based on this operational change?

Many thanks for any advice.