Don’t listen to Amazon and raise your budget and bids. Your current bids will probably do just fine. There will be enough sales volume that you can probably even lower your bids and still be okay.
Remember - Amazon makes a huge portion of their revenue on advertising.
I agree that PPC is a waste of money unless you are launching a new product and have a good market analysis and an advertising strategy.
Prime Day will drive sales to your listings naturally. In the alternative, you can use social media like TikTok to promote your products.