More turpoprob aircrafts and more Airbus a330,a340,a318
I think that the A330 was already in the works by the community, the A318 is used only by Air France and privates, and the A340 has just the A343 as the "popular one", the most used even now.
Since the 345 and 346 are being retired and also having all the a320 series cockpit just with a few differences i don't think they would be a good addon in the near future.
As FlyWorld said, the priority to smaller aircrafts, including but not limited to business jets and GA is more needed as of now, but i think another smaller, more modern and more used Airbus aircraft like the A220 could be an exception, a great addition!
Considering its used by 21 airlines, has a modern cockpit and recalls the A350's cockpit I think it would be great.