My campaign ROAS is better that my target ROAS. What should I do now to scale?

Firstly, congratulations for running a profitable ad campaign. You're well on the way to building a long-term sustainable income stream.

Now you have a decision to make as to whether you would like to increase your budget or increase your target ROAS.

If you would like to target increasing the profitability from your ad spend, increase your target ROAS by 20% every 14 days. You can do this for as long as your actual ROAS is higher that your target ROAS.

Alternatively, if you'd like to increase your revenue and stay at the same level of profitability, go ahead and increase your daily budget gradually (by 20% every 14 days).

Of course you will do a mixture of both over the coming months and years as you scale. You just need to make a decision now as to what you'd like to do first.