What is the best cold DM practice that you think still works in 2026 ?

I have been trying to sell " Consulting and Auditing " services to UK e com brands with leaking pipelines and especially websites with poor UX. Have been trying to pitch them on Instagram but it has not given me fruitful result with open rate less than 1% and no conversion so far ( data set of around 300-400 DMs )

My messaging style is : Hey, I noticed that < problem in their website > which is costing you < relatable metrics >

Would you be interested to know how simple changes can help you increase your Conversion rate of website and get more orders without increasing the marketing budget.

No fluffs! No strings attached - just an honest conversation, looking forward to connect

Please tell me what practices I can do and opt to be better and start earning fast so that i can re invest in the same business and can have proper channels

P.s.: To all promoters of XYZ tools, no I don't want to try yours ( thank you in advance 🙏 )