Facebook Group Moderator

Hi, I am running a small business in New Zealand selling campervans. I have 3 Facebook groups regarding backpacking in New Zealand; each has 47k, 36k, and 26k people. I haven't managed them at all in the last 3 years. I have selected 'all posts need to be approved', so not many posts in the last few years. The groups' condition is not looking good now. I didn't have much time to manage it; approving posts, etc., cost me time, and I'd like to have them back live. Honestly, my budget is limited; I don't want to spend too much on it,but if you're doing well, this could be long-term. I'm running this group so that when people join, they will see our website, and I have put our ad at the top of the group, which might bring in some traffic. I want some help to manage these groups, removing the rubbish posts etc. I don’t think you have to create content daily. However, I would like to hear your thoughts, your proposal, and how much you charge. Thanks Here are the group links: https://www.facebook.com/groups/BuyAndSellBackpackerCarsNZ/ https://www.facebook.com/groups/bpknz/ https://www.facebook.com/groups/backpackingnewzealand/ My business is : www.backpackercar.co.nz We could start with 7 days, then 30 days, then on a monthly basis. But please check my groups first and let me know your thoughts. Thanks