MY Current SEO Strategy, let me know if i should continue change/stop

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Hello,
Currently below is my SEO strategy for my website. My website is about selling accessories, so its an shop only, but products are newly added every 2-3 days or are bare minimum weekly, so does gets updated.

1.) I look for forums related to my niche make posts or thread with my accessories, making sure it applies with the forum, I make limited amount of post per forum per day to make sure I'm not abusing the forum or the system. But every single one of my post will contain a linkback to my shop. Now here's my question for this strategy, once I keep posting on forums, after months or times later, I might provide the same backlink to my store, I mean the same exact URL, but in different thread/post but in same forum, would that be consider abusing? or its fine as once posts forum there is no way to keep track if the link is used before, instead I post what's helpful relevant to the thread or in my thread. But I'm assuming this doesn't happen every often, maybe 1-30 or 1-50. Then what limit posts per forum would you recommend to stay at per day? that way I'm not abusing the forum or the system. Every single one of my account in those forum will have posts with a linkback, not that they're a spam but I focus on relevant post and accepts linkback, would that be ok? as it will keep going by daily, 2-3 days or weekly.

2.) This strategy I haven't done yet, not sure how it will work but I gotta learn. I will look for blog websites, talk to the owner see if they allow linkback to my website if I make a blog comment on their website.

3.) Same as #2, haven't tried. I will look for article websites, make an article, then a linkback to my website. Question is, any specific areas I need to focus on for linkback?

Lastly I want to learn abut keyword training and how would I start off or works.
Thank you and appreciate for all your time.