Expert on Meta Advertising, Google, Instagram for B2C company - High Ticket Sales

I have a meta ads account and google account already established. CAPI and conversions already set up. I am a B2C business that has a high ticket offer from $4995-$9595. At one time I was doing very well and with the recent AI updates/and or increase in competition on both platforms, my sales declined significantly At one point I was doing 4ROIs on both platforms, now I am searching for someone who can look at everything- Campaigns, landing pages etc to help me scale again. I need help mastering meta and google once again. I need to start this asap. I am not looking for a large agency. I need someone who is going to work 1-1 with me until I understand what I need to do and then take over my advertising.