What would be some possible ways of escaping higher gravity planets?

I know that chemical rockets would allow for some minor loads to escape the gravity of a planet with higher gravity.

My question is, what kind of technology would possibly allow a dominant species to escape the gravity of a planet and become a somewhat spacefaring species?

Are there any possibilities in today's technology? Or what fictional technology might accomplish this that might be in our near future?

Edit: Thank you, guys. This has been a treasure-trove of help and information. I now have enough information for my later chapters as well. I honestly appreciate it.

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What would be some possible ways of escaping higher gravity planets?

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