Are there any flaws in the promotion strategy?

Question

Search Engine Optimization

Good day. I would like to know your opinion about the tactics of promotion and its effectiveness. I know how everyone hates SEO, but still =)
So, a one-page site to promote a sand trading company (region and region). There are no internal pages other than the muzzle. The site contains 4 blocks: a brief history of the company, benefits, description of services and the offer itself. There is a site about 4 months. did not advance before (stopped at internal optimization). Some time ago there were problems with hosting, which caused the site to lie with a 404/403 error for several days, but it didn’t seem to be thrown out of the search (in the webmaster it is displayed as indexed and in the search results, I hope there is no ban).
So... I'm going to make up the core of

• 1-3 bass (diluted entry, maybe I won’t fool my head with bass, they will pull themselves up)
  
• 2 HF (header h1 and site description)
  
• 3-5 midrange in the body of the commercial offer article on the main page (2 occurrences each, exact and diluted).
  
• Maybe in other blocks (in "Advantages" and "About the company") I will duplicate the MF from the commercial offer or add 1-2 new ones (1 diluted entry each).
  

In general, there are about 15k words on the site, about 3 are supposed in the commercial offer. The
total plan is as follows ...

• Purchase of 3-5 external links to the midrange contained in the text of the commercial offer on the main page. And maybe one link just to the main one.
  
• Purchase of Ya.Direct for 1-2 HF (h1 and descriptions) and 2-3 MF from the offer. Or on a random treble on the topic.
  
• Duplication of commercial offers on boards (olx, avito, etc.) + forums. This is more for direct attraction than for site promotion.
  
• The same duplicate in VK and other social networks, also not for promotion, but for adding positions in the issuance of pages from social networks
  

The goal is to reach 5-10 orders per week in the near future.
Since I have not been interested in SEO for a long time and I don’t know the latest trends, I would like to clarify some details, namely:

1. Is buying external links relevant? If yes, where is the best place to buy?
   
2. Is the mutagen still moget or is it not worth bothering with it to search for NK requests? Or are there even better alternatives?
   
3. Won't promotion be affected by off-topic text? I mean, will the text in the "About the company" block spoil the overall picture?
   
4. What about PF? Since the site is not built for that long user stay, wouldn't that be a problem and a reason to downgrade the site?
   
5. What is better to take in YaDirect, a purchased place on top or 1 place in the search results (I didn’t understand the latter a bit)? Maybe just move?
   
6. Is it still possible to parse hints with the word **?
   
7. Is it okay if I don't highlight the keys in bold text, because for me this is a bit vulgar and intimidating approach? =)
   
8. Did I miss something?
   

Thank you all in advance. I will be glad for your answers and advice.

Answer 1

You can’t promote a single-page on the subject of sand for requests where full-fledged sites compete
1. will always be relevant, sape to help
2. maybe more
3. no, it won’t affect (only if it’s not about cars, girls, etc.)
4. try, experiment (video to help)
5. look at the cost of a click, and according to the result of the direct budget forecast
6. parse, it helps
7. all the same, it is desirable, but to emphasize, as it were, I help in finding key information for a person, and use it
I have experience in promotion 3 sites on the subject of selling sand. It is better to make a full-fledged website and invest at least 15-20k in promotion.