Nothing at the moment, shall just bank the cash and let the nice interest rates earn me money until something maybe takes my fancy.
I personally feel that latest and newest supercars don't really appeal to me:
Ferrari - 296 and F8 having driven both I'd never want to own either, neither match a 458 for engagement on the road, not even a 360 for that matter. Also a used 296 is 300k plus.
Lamborghini - Huracan Technica & Revoluto or whatever it is called, questionable looks, the Revoluto is 500k and though its bonkers quick is no doubt just plain too quick to ever enjoy on the road and though the later Huracan's improved vastly to drive, particular later RWD models, they are in short just an expensive Audi R8 and the R8 could technically be considered more useable and engaging, more storage and manual gearboxes. Though the STO is my favourite but totally inpractical.
Maserati - MC20, looks nice and becoming a relative bargain as I know some people have managed to buy used at just over 150k, so these have lost 100k in just one year, but to me the engine is not special enough.
McLaren - Out of the modern stuff, the Artura is the best driving modern supercar, a hybrid but still weighs sub 1500kg and has hydraulic steering, the downside is I don't they they are worth 250k plus or 200k used, when they are 120-130k used is the time to buy, other than that 750S is an expensive 720S and another sure fire way to hose 100k in just a year, you can buy a 720S today for 110k. The 600 LT is by far their best car, I am biased of course.
Out of new supercars there is nothing I really find attractive or want, technology has made them less engaging and fun, then the pricing is generally ridiculous with most new supercars now costing 300-500k, I think at these prices and anyone buying this year could get extremely burnt, but at same time I am not alone in my thinking as new supercar registrations are massively down due to above but of course finance now cost a lot more and as the cars also cost more, the moderately rich who could once afford to buy new or nearly new now no longer can justify it or afford it.
As such I think long term the pre 2010 supercar market will only get stronger and stronger in years to come, so selling my 458 is probably in many ways a bad idea, but I've had my enjoyment and it cost me circa £5000 a year to keep it, so every five years that is £25,000 in servicing, road tax and insurance etc and as such any potential uptrend it may have is nullified by ownership cost and I feel I've done what I can with it and enjoyed it thoroughly but its now time to turn it into cash, let that cash make me more cash and also save the £5000 per year in ownership cost.
I absolutely love my 360, it is so engaging and I feel is more likely to explode in value than the 458 especially as 360 CS are all now 200k plus and some even hitting 300k, which is very good for 360 manual residuals, but that aside I literally do not care what it is worth now or in 3/5/10 years time, the car is for me to enjoy and if its worth 20k or 200k in ten years I don't care, of course the latter is nice but its not the reason for ownership, I buy to enjoy and make memories and have fun along the journey.