It’s all about the marketing
Track your conversations
Build an expertise
Share the wealth
Now you have some expertise, and clients coming at you for multiple work, you’ll find that you don’t want to get involved in all that is coming in. So, send them to other hostel consultants who specialize in areas you don’t. In a perfect world, they would send some to you too. If you don’t believe in karma, see if they are willing to give you a commission or compensate you somehow else for the lead. You never know.
Learn your numbers
You have to back everything with numbers. Reports. You have to source data that can give you some projections and all. HVS is good here. Tourism reports are important. On top of this all, you have to do in excel what they cannot do, and I find many hostel owners that are fancying a consultant are actually pretty smart. Know how to use pivot tables. Even better, know how to go beyond excel. Learn how to set up a database and do SQL queries. Perhaps one of these tools can help. Also Duetto might be valuable, see if you can get inside and learn it.
There are many quality courses online to learn data science and the programming basics. Forums too. Perhaps contribute to an open source program too build these skills. This will give you the quality a seasoned hostel owner would desire, and pay you accordingly.