As of the last census 33,000 people in Scotlnd identified as Indian (
source), with the largest dispora being in Glasgow, then Edinburgh then Aberdeen.
Another Chinese link isn't out of the question, although that could also be said for Glasgow.
Canada is pretty much covered, Vancouver the obvious missing Scottish link, but Air Canada mainly developing that as a Paciffic Hub rather than a Euro hub - probably happy sending traffic through Toronto for the time being.
American East Coast is very well covered - not sure what really would be next for EDI, there has been rumours for years of another US route - MSP, DEN, IAH, SFO, LAX, SEA all mentioned since at least 2023 - nothing materialised.
Europe is very well covered, there isn't really a glaringly obvious gap in the EDI European network
Egypt seems to be a very slow developing market compared to elsewhere in the UK, HRG is currently seasonal with easyJet, and SSH is only just returning to the network this year, with EZY 1x week, Jet2 has pushed its SSH launch back from February to October
The priority with the airlines just now seems to be larger aircraft - easyJet has based 2 A321's this year (20% of based fleet), Jet2 has 3 (42.86% of based fleet), and Ryanair has 8 MAX aircraft based (66.66% of based fleet)