So with likely only 4 legs left in the race, I believe it's very likely that the next 3 legs will be in Asia with the final leg in the USA.
I don't believe they will visit the Middle East, since Morocco has already been visited. Also, I don't think Australia or Oceania will be visited as they have already visited quite a few English speaking countries and the Caribbean. I have a list of 5 countries below that are very likely to be visited.
India - Always possible for TAR to visit India. Bangalore is a possible destination. Never been visited and TAR could build tasks involving Bangalore's IT industry.
Nepal - Never been visited by TAR. Would be amazing if they visited Nepal, but I think it is the least likely country of the group.
Laos - Never been visited by TAR. Cancelled leg a few years back. Long Overdue.
Philippines - Only been visited once back in TAR5. Long Overdue. Manila & other island destinations. Easy flights back to US.
South Korea - Last time visited was TAR17. Seoul + Suwon possible destinations. Easy flights back to US.