Given your level of experience you should be able to do your ATPL exams without the need of an ATO.
I'm not going to talk about which country is best for the exams because it's been more than two years since I've done mine, but you might want to avoid the UK due to Brexit and whatever might happen after October.
Regarding your type ratings, you need to do a LST in a simulator and there are job opportunities for captains.