What should I do now? · Google Ads eCom Lab

What should I do now?

and everyone, I would love to get some feedback on what I should do next.

Currently I'm doing US fashion dropshipping and it's been 2 months from June to August.

Now at 4.4k SKUs, 190 products, slowly adding more
CPC dropped from $1.4 to $0.6 USD since domain switch in start of July
Spent $3.6k USD, WeTracked on Google shows 1.37 ROAS but on Shopify is 1.8 ROAS total with 95 orders
Last 7 days I'm at $120 USD/day with 1.6 tracked ROAS but actual is 1.88 ROAS with one PMAX Feed only campaign

So far I've just been drafting products using Pythago that spent $19-24 USD with no sale. And I've only been using keywords in product title and description, didn't expand more keywords in GMC or SEO title/descriptions.

How do I improve ROAS and spend?