Back on Amazon after 6 years, PPC, Keywords etc

We first started selling on Amazon almost 10 years ago, then covid happened and we decided to stop, after 5 years of hiatus we rebranded and trying to get back on Amazon as FBM first. A lot of things seems to be different now, than 5-10 years ago, so I consider myself to be a newbie. I added 1 product 4 days ago : pics, title, description, bullet points, keywords, all seems to be good, our new brand name is quite unique, but still searching it without quotes won’t return any results (or it’ll be on the 10th page). Is it normal? Ads. I launched 3 ad campaigns 2 days ago, tried higher bids (vs suggested) with 50% dynamic increase, manual and auto targetting, but still get no impressions, how long does it take for ads to start working?
Would you say it’s recommened to hire an agency to audit a listing? What was your experience?