Seeking Experienced advice for newer retail website

Im hoping a few experienced site owners/retailers will share some tips and advice regarding free/low cost advertising to increase site traffic. So far my small startup business has been somewhat successful. My problem is I recently purchased a piece of land and relocated my business, After the move it ended up taking almost a month to get internet due to the local system being overloaded. In the end I opted to install satellite internet and have resumed business. My problem is after a month of no self/manual advertising my site traffic took a big hit, Subsequently so did my revenue stream. My question is what advice could could you offer to better promote my site preferably for free, I have no issue putting in the hours to do the work myself (I started the business/company from scratch myself with virtually no capital as well as building the website and designing and manufacturing my own product line). Our specialty is high efficiency led grow lights and related indoor gardening items. The website is approx 6 months old and currently has 1200+ back links mostly through online classified sites and CL. For a brief time the site was in the 3rd position on google for the search term "Led Grow Light" but quickly began to fall to a sadly low ranking. The site itself is currently 40 pages with plenty of content and products and a reasonable SEO score. In the building of the site I was pretty vigilant about tagging photo's, organizing content, adding quality page descriptions, etc. Ive also kept the sitemap updated on the major search engines. Since resuming advertising on craigslist ive found it increasingly less effective and more time consuming. It has now gotten to the point that every ad is flagged/deleted withing minutes of being viewable to the public in any/every city, The CL account is not suspended and i do not believe the ads are being ghosted so i assume someone is targeting my ads with an auto-flagging program.

My hope is someone can share some ideas or methods that will be more effective and productive regarding advertising and increasing site traffic. Ive done some research obviously, But most of the free or low cost methods seem like a scam or are contradicted elsewhere, The others ive tried so far have had little effect. Any wisdom and advice would be greatly appreciated. Thanks in advance for anyone who takes the time to share some knowledge on the subject.