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Hi Enjin! If Martijn's response answered your question, mind marking it a "Good Answer?" Otherwise, how can we help more?

Without a doubt domain.com/shop. Think about it though from a customer point of view, most languages read from left to right, so with the /shop they subconsciously read your brand name before the shop, however with the shop.domain.com they may just stop when they see shop as that's where they know they need to be.

Hi there, I'd echo the points above regarding on and off page, especially off page: a poorly optimised site from an on-page perspective can gain rankings based on its great backlink profile. A perfect website with perfectly optimised pages will not rank if it does have links. Have you engaged in any link development during the fours months? Along with looking at the points Erwan raised, I would look at the backlink profiles of your competitors in the area and decide on a 12 month goal for how many links you need and from which types of sites. Have a look at the link development category on the Moz blog for years worth of good ideas as well.

Thank you all for your Answers, I think the best solution is to craft content on this page. I hope it will be back soon on first page