Find some B2B Listing sites and list your website in those. that will surely help you to get traffic. Also, choose top 50 or 100 directories and submit in them (for backlink purpose). Always use genuine details (email id with domain extension, real names and other details) to get approved.
You may choose a sub-category under the category "Industrial Goods and Services" like "Machinery and Tools"
Ignore people telling you to submit to a lot of directories. Only submit to quality directories if any that show up good positions in search engine searches. Search (your product or service) + Directory
Try adding your website to the directories where customers actually appear. In such cases, it pays to pay even to appear at that place.