not sure whether I understand correctly.
You asking for a recommendation about upgrading your 2070 card ? Such recommendations is not the topic here, but you can find lots of discussion within the forum ( example search Search results for 'upgrade gpu #self-service' - Microsoft Flight Simulator Forums ) or you can open a new topic if you not found a related one 
One example topic:
PS: the 2070 is still not a bad card if you not use 4K