Hi @Celeste242
This is a community for guests and hosts to ask questions relating to the Airbnb rather than for businesses to advertise their services.
There used to be a platform for Superhosts to be able to offer their property management services to other hosts but unfortunately this was discontinued. This was a great service as hosts could be confident those offering co-hostings/property management services had great reviews and experience of hosting on Airbnb.
Your comments about it costing money for hosts to put up job listings to find suppliers is a confusing one. That's not how hosts find suppliers.
If you want to promote your property management services to hosts, invest in a marketing plan to reach hosts you have identified as your target market.