You can contact the workplace where you would like to work. You can call the workplace and schedule an appointment with the manager. You can leave your job application and CV in the workplace, even if the company cannot offer you work immediately. In your job application, clearly describe your skills and what kind of work you could perform for this employer. The manager may contact you later when there is work available.
In Finland, only a small proportion of vacancies is advertised. Employers would need a lot of time if they only looked for employees by advertising their vacancies. That’s why employers often hire people who they already know or who have themselves contacted the employer.