Ask HN: How do you grow demand side for a Marketplace?

We have recently launched a Live virtual travel experiences startup, that uses 360 degree camera to give all around views.

We have grown the supply side and have 20 tours available across the world, adding more weekly.

I would love to know your opinion what is the best way to tackle the demand side now? We do some social postings and approaching people on media who asked relevant questions, few small blogs do a writeup.

Thanks