โก๏ธ Firstly you should use pixels and also do integration with IOS.
โก๏ธ. Secondly use more MOF campaigns that is Retargeting your old audiences which has high interest in your products because now a days 80% of sales are converting through MOF campaigns.
โก๏ธ. Use Lookalike audiences a-lot but keep in mind you should only use 1% to 3% only(Crucial).
โก๏ธ Spend more on retargeting campaigns not on cold campaigns(as its waste).
So above is the tested strategies for current clients and we are getting great results for clients.