You can look in to hiring a Social media marketing manager and they will do all of the below but if you can do it your self that would be even better (they can be quite expensive)
Video marketing (take plenty of videos)
Use all social media platforms insta, tiktok , face book.
Build your portfolio take lots of before and after images.
Contact your local hair salons nail salons create a deal with them to put your leaflets in there salon.
Social media give always. (a great way to build your followers)
Use hash tags on all of your post and make your page public.
Download Canva on App Store and you can create some offers.
Contact influencers offer them a free or discounted treatment in exchange for them to post on there page.