Spending 100k/month but only earning a few tens of thousands is clearly a big problem in the optimization stage. I have encountered similar situations with clients, usually the cause lies in the target being too broad, creative not testing enough variations, or the funnel is not clear so the cost increases quickly. I suggest you divide the budget to test many target groups, use A/B testing for creative, and most importantly, closely monitor the ROAS index at each stage to cut losses in time. Sometimes reducing the budget reasonably is more effective than "burning" it.