It sounds like you'd like to be in a position to help startups grow, and know strategies for that.

The answer is that it depends on what you'll be doing and the nature of the startup you're helping. There are a number of generic tactics you can use, however it mostly depends on the nature of the startup you'll be helping.

Not all of startups might want to grow internationally. For those that do, they might not have a hard time growing outside of their country, it depends if their offer can be monetized outside their regions and traditional markets.

Give us an example of a startup, and while you're at it, here are some quick generic strategies: http://blog.import.io/post/10-minute-growth-hacks-that-will-jumpstart-your-marketing-strategy