Before answering your question, you need to provide more info. What have your long runs been like - both mileage and effort. And what was your effort during the race?
The reason I ask is that it is unusual to go from your first HM immediately into running one a month. I'm not saying you can't of course. Just that additional training depends on what you've been doing and how hard you've been pushing yourself.
In addition, it would also be helpful to explain if you want to do these next HMs at the same or an easier pace or whether one in particular as a goal race for pushing harder, setting a PR, etc. Offhand, I'm not familiar with those two other races you mention, so if their courses are significantly hillier, etc., it would be good to know.
PS: 2:08 is a great time for your first HM! Congrats on the good pacing! (Pacing is more important than PRs. You're doing the right thing by focusing on pacing.)
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