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Really what is happening is that you are just pushing the things you don't need to the back of your brain. You did not push them outside of your brian. If you review the things you learnt in school, you will get the returning lightbulb. The only problem is that the lightbulb may come a bit slower, but still faster than the very first time you learnt these things.
If you want to always have constant clear memory, it is best to review textbooks at least every week. Do exercises like old mathematics homework or engineering projects. You can bring classic literature to work so you can read during breaks, like Tolstoy or Eco.
Right now, I work part time in a call centre. Later I want another full time job, so total two jobs. I take online courses from university and technical college and also read other unrelated topics by borrowing and buying secondhand books. This is very cheap to learn more.
The university and community colleges in your city will also organise seminars, debates and clubs. Even if you cannot participate actively because they ask for sign up, you can go attend and listen.
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