PPC Question: which option to try?

Hello everyone,

I have a sponsored products auto close-match campaign running on a product, and hitting the daily budget very quickly. This is the only campaign that has produced decent results for this particular product. What is the best way to scale it without disrupting its current success: option A or B, or something else?

Option A:

Increase the budget of the campaign by 10%-20% every few days, and observe the outcome. If all is good, increase again by another 10-20%, and repeat until something goes wrong, and if something goes wrong then undo the last increase to try to stabilize.

Option B:

1 – do not touch the existing campaign.

2 – create a new campaign with exactly the same parameters as the existing campaign, but with higher budget. Monitor closely.

3a – If the new campaign does well, then get rid of the old, and keep the new.

3b – If the new campaign does not do well, then come back here and ask for more advice 🙂

Many thanks in advance for any input / advice.