"Freelancers" are easy to come by, but finding clients and jobs is much more difficult. I'm not exactly sure how you can drive more clients to the platform, but it's absolutely essential and really the core piece of the entire project. If you want the platform to work out, you need to go hard on promotion to clients and not freelancers. Otherwise it's like OnlyFans with only one or two small time creators, which isn't going to be worth the time. Lots of simps out there, but what matters is getting the creators. Similarly, you need to find clients for the freelancers on the platform.
Marketing wise, there is the usual SEO, but what you can also do is send out emails to all the vendors on Monerica letting them know that if they need any professional services, they can use monero.jobs for that purpose. There are other crypto focused listing sites like cryptwerk too. Outside of that, I can just presume networking is going to be primary way to get the clients to monero.jobs.