Try resetting your trip counters as they are used to work out the GOM
As
@Jomarkh and
@Gadget Geek have correctly stated, your PREDICTED range reported after a charge, is totally based on the historical data stored within the car system itself.
Leaving the trip counters untouched is the favoured option by some, or resetting the trip counters is favoured by others, it's a personal 50/50 choice really.
I always favour the resetting option myself, but that's just me ?

!.
IF you ARE at all concerned about the PREDICTED range the GOM has recently been reporting ( as you must be, hence your post ) then try this out !.
Before you commence your next charging session, remember to reset both trip counters back to zero first.
Now after the car is fully charged, you will now see that the car reports a figure more closely related to the what you where seeing before your concern !.
Expect some very slight variation due to the climate conditions of course.
Our Trophy LR is about 18 months old and covered a similar mileage, are charging needs are satisfied by our A/C home wall box and no D/C rapid use.
In order to give an indication of what you SHOULD be receiving, then here you go.
Reset trips, then set the charging level to 80% SOC.
When complete, on boot up your GOM should now be displaying a predicted range of 212 miles.
In the standard default range of NORMAL & Regen level 3 of course.