I would highly suggest in paid ads, Instagram and Facebook. We offer marketing management and consulting packges. Check out www.digitlhaus.com/shopfy -fill out a project request and someone from our team will get back to you the same day.
Are these your products or are they being dropshipped from another company? If you own the designs and ship them yourself, have you considered selling to local clothing stores? If so we can help you get all the clothing store contact details as you could possibly want! More info here.
I would suggest improving your SEO little by little in order to get organic traffic someday, meanwhile you can use paid search Ads to get your shop known.
You can use Facebook Ads, Adwords, IG Ads...
Starting a shop requires patience and work!
Free Professional Adwords Campaigns: https://apps.shopify.com/cleverppc