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One example of space civilization being written along with medieval fantasy setting is Will Wight's Cradle Series. Maybe you could take inspiration from that. In the series, the main character (fr...
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Source: https://writers.stackexchange.com/a/36770 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
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One example of space civilization being written along with medieval fantasy setting is Will Wight's _Cradle_ Series. Maybe you could take inspiration from that. In the series, the main character (from the medieval village) meets another character (lets call her X) from the space-faring civilization, pretty early on in the story. MC sees X as some kind of god (X is very powerful - both personally and technologically). This meeting is the true beginning of MC's journey. Although the series never clearly states it as such, but the reader can see that there is a clear progression from medieval age to space age. The space-faring civilization is simply a more advanced version the medieval civilization, that has evolved over millennia. MC's journey, as the reader can see, is to go from the primitive to advanced; to go from a small village on earth to travelling across galaxies.