So midjourney is very 'casse couille'. They don't provide api access and using MJ through a third party tool is forbidden.

I don't really know what I have to do. Should I try to use self hosted solution (or tier hosted because I don't have the hardware) ?

it will be much more harder because MJ is a super multi model.

Another pain, this solution requires hosting solution.

Perhaps PaaS or SaaS solution already exists