How do I level up faster? Is there anything else I can learn?

[polv]

Even old threads you have found can be good for other aspects aside from Kanji e.g.

The Ultimate Additional Japanese Resources List!

This post is a list of Japanese resources and stands as a collaborative wiki gathered by the WaniKani Community. If there’s a resource you feel is missing from the list, please add it by clicking the edit button above. Include an edit reason by clicking the button at the top of the edit window. Many of the resources here are free, however, the ones that aren’t are marked with a dollar sign $ or otherwise noted. Click on the triangle symbol ► to open a section’s resou…

which is a pinned topic in Japanese Language > Resources

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There are also some Master Guides to Learning Japanese, e.g. Tofugu (company behind WaniKani), Moe Way (this hover dictionary web extension)