If you feel your campaigns have performed at a *good* return for around 14 days minimum, you can start scaling your campaign.
A "good" return is subjective and based on your AOV, LTV, margins etc. Know what your ideal ROAS or return is based on your own business.
Turn up the budget by 10-15% as to not shock the algorithm. Wait another week and assess before adjusting the budget again.
Note that your ROAS will likely take a bit of a dip when you increase your budget. This is normal. We always make sure our ROAS is ABOVE the ROAS goal before scaling because we know it will dip when we turn up the spend.
Happy Scaling!