1. Attend relevant training courses: Agricultural electricians can improve their skills by attending relevant vocational skills training courses, which may include power engineering, electrical automation, power system operation and maintenance, etc.

2. Obtaining professional certificates: Agricultural electricians can obtain relevant professional certificates, such as electrician certificate, power facility installation and maintenance certificate, etc. These certificates can prove their professional skills and experience.

3. Participate in internal assessment and promotion: State Grid Corporation may conduct internal assessment on agricultural electricians and promote them according to the assessment results, which can provide opportunities for agricultural electricians to become all migrant workers.

4. Pass the unified formal recruitment examination of State Grid: Agricultural electricians can take the unified formal recruitment examination of State Grid, and if they pass the examination with excellent results, they may become all migrant workers.

It should be noted that the specific conditions of different regions and different units may be different, so the specific methods may be different. In addition, certain conditions and requirements need to be met, such as work experience, skill level, education and so on. Therefore, while upgrading their skills, agricultural electricians need to pay attention to relevant policies and assessment standards, and actively strive for opportunities to become migrant workers.