We encourage you to implement SEO strategies for your business. Businesses should capitalise on SEO and the chunk of leads and traffic search engine rankings offer. You can either build an in-house team or outsource the work to an SEO Agency or even outsource some parts and do some parts with your in-house team of SEO professionals.
But at the end of the day, it is your decision and if you are relying too much on other digital marketing approaches you may not want to spend heavily on SEO.