Depends on the length and topography of your product’s customer journey in relation to the industry volume of lower/upper funnel traffic, specifically in your mid funnel, when people are most targetable by brands before the purchase.
Do you see your customers going through a long educational period before purchasing? Then youtube ads will be very expensive. Is there already good lower funnel volume and you just mean to actually express your brand brand to the market? Maybe you should focus on funnel high-intent traffic first.
If you have an existing campaign, it’s more actionable to try and influence its conversion rate by pulling levers already existing within that calculation instead of reaching outside of it and hoping it does something. Even if it does work there is no way for your to prove that is what caused the change.