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Your best option is to use the GNU AGPL or GPL and sell a different license to companies who find those unacceptable. Be prepared to go to court in order to uphold the GNU licenses, companies will violate them a lot. Also be prepared to have companies reimplement your library from scratch in order to avoid the GNU licenses.

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Yes, copy left is really your best bet. While 'technically' not open source, there is also parity ( https://licensezero.com/licenses/parity ) which I think brings a few interesting ideas to this space. All of those options make It harder for your open source users though.

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