Hi Karine
New websites will take time to develop good rankings so do not be too surprised if you are not getting the volumes of search engine traffic you were expecting at such an early stage. Continue with your link building activities as this will have a positive impact on your rankings.
I have had a look at the competition around the phrase 'organic beauty products' which you have included in your homepage title tag and there are a lot of established websites competing for this term with decent PA and DA scores.
In terms of improving your on-page optimisation, the phrase 'organic beauty products' and 'organic pharmacy' which I am presuming are important for your website are not included anywhere in your homepage body content, which will make it difficult for your homepage to rank for them.
If you have the budget for PPC and the product margins/website conversion rate are strong enough to make it profitable I would recommend it. It can be a great tool for driving traffic whilst your organic presence is still growing but also for ongoing revenue generation as the PPC ads well by attracting a high proportion of clicks for relevant search terms.
On another note, make sure you are checking the search volumes on the keywords you are targeting. If there is limited search volume you will only see limited traffic even if you rank number 1 for the term.
Hope this helps