I am the main developer of 11 similar webshops which sells cosmetic products. They are in 11 different languages spread over Europe. We have improved significant the pages with the right content, headers, keywords and header tags, but it's time for referral links/backlinks that will point out to these domains.
Some domains need more backlkinks than the other, but you will see this when we share the domains.
Languages Domains: French, German, Spanish, Portuguese, Italy, Greece, Poland, Denmark, Sweden, Finland, Norway
What is important, they need to be linked with: