[REQ] How to host multiple domains on shared hosting that doesn't allow it

can younotjust use another freehost ?

there no way getting somethink that not allowed you upgrade .

use a free service or a very chead $2 a year host.

The solution is to use WordPress Multisite and then add the additional domains as parked/alias ones within your hosting account.

This might be a viable solution, but you would be forced to only use WordPress for your projects.