As everyone said, words aren’t everything. You need grammar and other vocab that Wanikani doesnt teach to back it up. This is not to say that Wanikani is useless. Without this amazing website, I would have been very very far behind compared to what I am now.
Another very important part to being able to read is experience, in my opinion. In this regard, Wanikani, or at least the wonderful people that make up this community, have you covered. Theres numerous book clubs that are going on on the WK forums, and people are always glad to see more readers.