Unfortunately like jprspereira said, there’s no ultimate WK-equivalent for grammar yet, which means learning and reviewing it will require more effort.
Grammar practice can come in many forms. The workbook exercises for Genki often involve you composing your own sentences, and once you get a bit further along you’re asked to write journal entries. This ensures you know the grammar points, because you must know how to use them in order to construct sentences with them. You can post your journal entries on sites like italki for corrections.
When I say reading, I don’t mean reading actual native Japanese books yet since that’d be extremely arduous. I’m referring to things like 1. the content offered in textbooks (again, Genki offers some good practice reading, designed to quiz you on grammar you just learned), 2. NHK News Easy (the grammar they use is pretty simple to follow but great practice to refresh it nonetheless), 3. Graded readers (these also use more simple grammar and are designed with language learners in mind).
BTW, I don’t mean to imply that you should stay away from Bunpro. Since there is a free trial, you can always give it a whirl and see if it suits your reviewing needs. But I wanted to stress that there are additional forms of practice, and that reading is definitely a necessity because otherwise you have no knowledge of how to apply your new skills. Plus being able to read something is really encouraging.