Been working on SEO on and off for a couple of years but my websites still doing badly for SEO. Why?

[SeoAccounts11]

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[GastonRiera]

Hi Luis,

I se that you have some issue with the linkbuilding you've been doing. I've done some backlinks check in Ahref and OSE. There are links that have no conection and some that are in chinese/japanese language.
Even more, you're having other issue that is related to some spam/malware in your site. Just make a quick search on google.com like this: 
site:www.petsinportrait.com, over page 2 you will find that problem.

Have you ever done a SERP competitor analysis ? Have you used the MOZ Keyword Difficulty Tool?

For further learning, there you have some other blog posts that expands the topic.

Advanced Local SEO Competition Analysis - Moz Blog
Competitor Analysis for Linkbuilding: A Guide for People who Hate Linkbuilding - Moz Blog
Conquer Your Competition with these Three Moz Tools - Next Level - Moz Blog
The Illustrated SEO Competitive Analysis Workflow - Moz Blog
Competitive Analysis in Under 60 Seconds Using Google Docs - Moz Blog

Hope it helps.
GR

[ClaytonJ]

Gaston has hit the high notes.  I would also consider an ssl certificate.  You are correct about your on site optimization it is pretty good.  Good responsive site.

The links are the major problem. They are not high quality, relevance / trust the clear factors.

Hope that assists.