Expectations for a new pixel & ad account?

I started working with this very small brand ($7k on shopify this year) and they have worked with multiple agencies in the past but no one has gotten them results. In total they had spent $12k and brought back a bit over $1k in revenue.

When setting the campaigns I had an issue accessing their pixel, so that combined with the poor performance of previous campaigns, I decided to create a new pixel and a new ad account.

I was aware it will delay the results because It would need to test different audiences and get multiple purchases until it we can see steady results, but that's where I'm starting to stress.

Initially I was planning to do an ABO to test but since the budget is 100usd/day I decided to go for a CBO, just a single campaign.

The product advertised costs $25 and I'm running 3 adsets: TOF 5 statics 3 videos, MOF 2 statics 1 video and BOF 2 statics. 80% went to TOF.

So far the numbers this week are:

• Spent: $657
• Reach: 4,731
• Impressions: 8,905
• CPM: $73.83
• Clicks: 274
• CTR: 3.08%
• Link clicks: 158
• Link CTR: 1.77%
• LP views: 158
• ATC: 10
• IC: 7
• Purchases: 3

I've been monitoring daily and the days really differ from each other, some have high CPM but high CTR (those have brought the purchases) and some others low CPM but very low CTR, so there is definitely some testing in different audiences.

Until when is it really normal to get bad results for meta to optimize, becasuse I'm starting to stress about not being able to get them good results.

I'm I doing something wrong? Should we keep spending? Am I over-reacting? I really do not what to expect at this time, and any advice/thoughts would be very much appreciated.

Thanks!