The internet store of gadgets

A very competitive niche with a fairly high price per click. The budget is scheduled for a month ahead and is always limited enough. Therefore, spontaneous tests and expense in this project are not welcomed.
During the quarantine, the project marketer made a failed decision - a reduction in the advertising budget, which resulted in a sharp decline in sales (April). Fortunately, we quickly noticed this and decided to return everything as it was, as well as connected new tools such as dynamic remarketing and Smart Shopping, which allowed us to rapidly increase and increase sales (June-July).