- Submit plugin to WordPress directory.
- Offer it’s free version first.
- Submit plugin to ton of other different repositories to offer it free first.
- Keep track of different related Facebook groups and recommend your plugin there whenever you see any related post there.
- Do proper Facebook, Instagram marketing of that plugin. I.e.: Creating Facebook group and pages etc.
- Write different blogs about that plugin and do guest posting even you have to do it paid.
- We can even mention our plugin in the plugin dashboard of some other popular plugins by contacting plugin owners/founders/developers.
These were some methods in my mind. Let me know in comments if you have your own method in your mind.