If you do not want to add certificates, then you can try these. I hope these things will help you to complete your profile 100%.
Add Linked Account +10% (max 10%)
Add Additional Employment History +10% (max 30%)
Add Portfolio item +5% (max 10%)
Add Other Experience +5% (max 5%)
Take Skill Test +10% (max 30%)
Follow this link:
Hi! i ahve been taking the skill test repeatedly but it is not helping with the completion, since the first test, I never recieved any percentage. could it be that there is something wrong with my account?