Now that Marketplaces like Themeforest are being abandoned by Envato in order to favor their Envato Elements market, WordPress authors will be looking for new opportunities, like selling their themes or plugins on their own sites.
Lemon Squeezy could add SDKs for WordPress, like other platforms have, like Fr*emius to make it easier for developers. Take advantage of the huge influx of WP devs that is leaving the Themeforest market or looking for new opportunities! :)