Yes, some learners do reach a solid B2 using De Opmaat, De Sprong and De Finale as a self-study path, but it is not common and it typically takes 18 to 24 months of consistent study (roughly 8 to 10 hours a week) to work through all three books properly. Most who succeed combine the books with regular speaking practice, because the series alone will not fix the exact problem you describe: strong passive understanding but weak active production.
Your profile is very typical for long-term residents. You have built a large passive vocabulary and good listening through immersion, but your brain has not practiced retrieving words for output. The good news is that moving from A1 to B1 in speaking is usually faster than building comprehension from scratch, because the knowledge is already there. The bad news is that textbooks alone, even good ones like the Opmaat series, will not force you to speak enough. They give structure, grammar and vocabulary, but they cannot replace live interaction.
Here is a practical path that fits your situation:
Use the books as your backbone, not your whole diet. Work through De Opmaat quickly to fill grammar gaps, then move to De Sprong. Do the exercises aloud, not just in writing. For every written answer, say it out loud twice. This starts building the retrieval habit.
Add a speaking habit from day one. Book two or three 30-minute conversations per week with a tutor or a language buddy. Use a tutor who corrects gently and keeps you talking. Sites like iTalki or local language cafes work, but evaluate them by whether you get 70 percent speaking time, not by price alone. If you prefer self-study, record yourself answering textbook prompts and play them back.
Do shadowing and retelling. Pick short audio at B1 level, listen once, then retell the content in your own words. This directly trains the bridge from recognition to production.
Track active output, not just pages. Once a week, write a short text about your day and then say it without reading. Note the phrases you could not retrieve and drill those specifically.
Honest tradeoffs: the Opmaat series is thorough and grammar-heavy, which suits your strong reading but can feel slow for speaking. Self-study without feedback risks fossilizing errors. And 18 to 24 months is realistic only if you are consistent; many people take longer. If you want a structured community and speaking focus, Dutch Fluency is one option, but any regular speaking practice with feedback will do the job. The key is to start producing now, even imperfectly, while you work through the books.