Analytics first.
Do not launch any campaigns blindly. Today, basic AI tools in advertising accounts can automatically find patterns in data, showing where every penny comes from and where the budget is being spent inefficiently.
Micro-testing.
Use small budgets to test different hypotheses. Artificial intelligence can help generate dozens of text and creative variations for your tests in a matter of minutes, saving your team's resources. Once you find a combination that works, scale it.
Focus on a single platform.
Don't try to be everywhere at once. Find one channel where your target audience is most active and squeeze the maximum out of it by delegating part of the routine work to the platform's algorithms.
Food for thought: Most businesses drain their budgets not because of poor ad settings (smart algorithms have already learned to optimize impressions better than humans), but because they don't understand what exactly their client is buying. A neural network won't invent deep meaning for you. You are not selling a drill; you are selling a hole in the wall. Is your positioning broadcasting this right now?