If you have been doing Macro before, then you probably understand the issues. Autofocus for true macro pictures is "a problem". You want to use small apertures, and then you have to decided where to focus and how much depth of field you want. Your camera will probably default to focus on the nearest part of an object without regard to its depth. Of course to photograph living things, then autofocus is often the only practical approach. Sony has a 30mm F3.5 Macro lens specifically for the APS-C type cameras (including your A6000). But to get the same magnification as your 55mm lens, you will have to use it even closer. If you are trying to photograph bugs and live, moving objects, then it will be more difficult because working that close will scare them away. You would be better off with a 50mm which might focus close enough, or need a short extension tube. You can buy special extension tubes with the electrical contacts to support the autofocus.
Sigma has a 70mm f2.8 "Art" Macro lens on the M-mount, but it is more expensive -- around $570 US, and I do not know anything about it. But Sigma has a good reputation.