Well, the obvious answer is a more technical version of death metal.
But that might be to easy. Most of the time technical death metal is played by musicians that are highly skilled and don’t want to play death metal in a standard way. Most of the songs in the death metal genre follow the intro, verse, chorus, verse, chorus, bridge, solo, verse chorus, outro formula.
Those who play technical death metal play around with that scheme, there are many changes in time signatures, or songs with weird buildups, songs without the common structures described above. And lots of guitar solo’s, dual guitar solo’s and influences from classical, jazz or eastern music.
It’s basically death metal influenced music without any of the common rules of the genre.
As you may have noticed it’s one of my favourite genres.
I always liked some technicality in my music. It started with1970s Rush and Kansas. Then came technical metal with bands like Watchtower, Sieges Even, Zero Hour, Twisted Into Form, Spiral Architect, Power Of Omens and the instrumental metal of Ron Jarzombek.
Later on I discovered technical death metal. Among my favourites are:
Gorod, Allegaeon, Obscura, Centaurus-A, Cryptopsy, The Faceless, Fallujah, First Fragment,
Hellbore, Illogicst, Job For A Cowboy, Martyr (Canada), Theory in Practice, Vale of Pnath, Virvum, Wormed and Xoth
Most of the above bands are on Tidal. Put on your seatbelts, watch the volume, grid your teeth and give it a try. 
You can start with this track. It will not be what you expect, well eventually it will be, but has some surprising sections.
I hope this was informative enough for you and everyone else. And believe me… I do understand the bemusement from some of you.