The logistics of one of you moving can usually be worked out, but first you have to be clear that you're actually on the same page.
So the conversation needs to go like this:
Do you see our relationship as a permanent one, meaning we will get married (if that is important to you) and have children together? If not, we don't want the same things.
If yes, when? When do you see us living together? When do you see us getting married? When do you think we should try for children?
If his timescale is too long or too vague for you, you point out that you're a woman in your 30s, you can't afford to wait that long before trying for children, and so if you're going to do these things with him you need a concrete plan to move to the next stage in your relationship (living together) and if you're not going to do these things with him you need to end the relationship (even if you are both happy right now) to give yourself time to meet someone else who does want to do these things with you. You can't afford to postpone this conversation, you need to know whether he is on the same page or not.
If he is on the same page and wants to live together in, say, 6 months, or a year max, and then get married (if applicable) and have children shortly after that, THEN you start discussing the logistics of making that happen.
Where are the possible locations? Where you live? Where he currently lives? Where he is originally from? Another location? For me the main factors to take into consideration would be, where is the best location in terms of you both being able to work in your chosen careers, and where is the best location to raise children? Would you have more family support for raising children in one of the possible locations? If there is a language barrier for one of you then that is also something to take into consideration, but you can learn another language if you put the effort in.
To cut a long story very short, the TDLR version is this.
Question 1: Do you both want to live together and have a future together, including children?
If the answer for both of you is an emphatic yes, proceed to question 2. If the answer for either of you is not an emphatic yes, break up.
Question 2: Having talked through all the logistics of how to live in the same place, including the impact on both your careers, is one of you willing to make the move within the next year?
If the answer is yes, start making it happen, put a timescale on it, and if nothing is happening within that timescale, consider whether it's time to break up. If the answer is no, break up now.
For what it's worth, I was in this situation. I ended up moving to his country, we got married very shortly afterwards, I will probably stay here for the rest of my life now.