That depends on how breakable your bank is and if you have restrictions on your time or not!

BA Holidays currently give you double tier points on trips of 5 days and longer if you start your journey in the UK. If you can take time off or work remotely, Marrakech flights from Gatwick in December are cheap right now (that's how I'm getting my last few TP to Gold next week!).

Here's an example you can work from:
LGW - RAK return in CE, booked separately, with a hotel for 5 days, with double tier points. 4th-9th December: 80+80 × 2 = 320TP for £408 (inclusive of the hotel)
OSL - LHR return in ET, booked separately, 3rd-10th December: £85 (and 10TPs you don't need)

You could even fly Norwegian or Norse to London to save yourself having to travel between LGW or LHR, as they fly to LGW.

At £485 (plus budget airport hotels) for 330 TPs that's as good as you're going to get on this short notice I think.

Obviously if you can't spare that much time away there will be other options and we may still be able to help you, but we'll know what your restrictions are first!