Pmax Performance starts decreasing ROAS after increasing the budget

I have been running multiple Pmax campaigns for 3 months and generating 5x Roas. I was testing the Pmax to see if it would work or not, and it was performing well, so I started increasing the budget every week by 15-20%. I increased the budget four times in total till now in a month, but from the last increase, the My Pmax started generating low Roas to 3x, and some campaigns came in below 3. It's been 10 days since the last increase, but the performance is not improving... What should I do now?

When I started, the budget for all Pmax was Rs 6k per day. Now, after a total increase, it is at Rs 10k per day.

Is anyone there who would help me out will be appreciated.

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