I want to change jobs, but I don’t know what social recruitment employers in the IT industry value, and whether they will conduct a written test or something like that.

The best way is through headhunting.

Headhunters can help you if you have more than three years of experience and have good communication skills.

The method of submitting your resume online seems to be no longer feasible for you. It is a method only used by college graduates and children who have not worked for three years. Either through introductions from acquaintances or through headhunting companies, I believe you will be able to find a job that suits you. You are a person who does great things! Good luck!