Worldwide cruise insurance in 2 years time

[kpjunk]

I am trying to get my world wide cruise booked for January 2022 insured but despite phoning or online 12 companies , they are all unwilling to cover so far ahead . The earliest is from a couple of companies who will insure 2 years from end if cruise date . Other restrictions include no more than 90 days cover ( my cruise is 99 days )  and the cost of the cruise of £24k ( so high due to single supplement ! ) . 

I have already paid £7k deposit .
 

Can anyone advise on where they obtained insurance for cruises booked more than 2 years in advance in the UK