The number of backlinks you need to rank really depends on the keywords you are trying to rank high for in Google search results. Most important is the quality of the content on your website, if the quality is not good then sending potential customers to your website will be a waste of energy. Make your content awesome and people will link for free.
View my blog post for [12 most important SEO tips for 2021 https://www.dcpweb.co.uk/blog/the-12-most-important-seo-tips-you-need-to-know
You can also check out my 30 tips for improving your website here: https://www.dcpweb.co.uk/blog/30-essential-tips-for-improving-your-web-design
