Is there a platform where I can advertise a pool of mortgages for investors to buy/invest in?

I think you will find everything you need on one platform and happy to get you a free tour of the website

Hey there I would absolutely love to do that.I'm not really sure where to do it on this platform. 

You give me rockstar deal we will clean the house out and even if there were satanic activities going on, we will pray for that house and dedicated it to Jesus."

Here is a list of potential options:Trello/Asana/Zoho Projects/Freedcamp/Basecamp/Workfront/Monday.com/Jira/etc,etc,etc,etc,etc - General project management software that includes tasks, Gantt scheduling, calendars, project forums, document storage & team collaboration toolsTeamGantt/Gantter/MS Project - Gantt Scheduling Softwares for creating Gantt Charts & Timelines, & managing tasks.Podio - Customizable system that allows you to build workflows, track tasks, track leads, etc.Smartsheet/AirTable - Provide spreadsheet style platforms with additional functionalities for uploading documents/images, assigning tasks, calendar, images, etcOffice 365/Google Sheets Spreadsheets - Believe it or not, a lot of successful flippers still manage their entire business in Microsoft Excel or Google Sheets. 

Strategic Purchase: Acquired a discounted double lot below market value with a $17k impact fee credit.Custom Design: Built a 6-bed, 5-bath home tailored for co-living or multi-gen use, maximizing tenant appeal.Efficient Management: Managed construction, and self-managed operations to minimize costs.Premium Marketing: Furnished the property and used multiple platforms to attract quality tenants quickly, achieving full occupancy.What was the outcome?

Most serious and qualified tenants are searching on the major 3rd party platforms you mentioned + realtor.com, redfin, and a few others.Apartments.com & homes.com are owned by the same company and may offer some additional marketing options.Another strategy to consider here is social media - video marketing.

I'd also check around Bigger Pockets and other platforms for reviews. 

I would highly recommend contacting local housing authorities and advertising on their suggested platforms if you haven't done so already.

I only mention this because I noticed your mention of Furnished Finder, which is the only platform I list my MTR, and FF caters to 30+ day stays.