Nickylodeon you should activate (temporarely) the possibility for potential
users to email you via Trisquel users settings (you can disactivate that
anytime after)
Riseup issues only one invite, and puts that new account under observation
thus its' makes the person who issued you an invite responsible ! ie if you
spam or do anything ilicit , they can loose their email account.
This is due to people abusing and doing illicit things with Riseup services.
There was a time when a new user would have to have several invites fom
different people..
Try this
Have you tried Riseup Black, installing Bitmask Riseup Black accounts for new
services that require the Bitmask application
https://riseup.net/
This should provide you with a new Riseup account.
--
There is also
https://www.autistici.org/
--
https://mail.zaclys.com/
--
Please remember that Riseup, Austici & Zaclys are run by volunteers and need
funds.
--
Posteo though looks like a very good replacement as far as email goes, the 1
Euros a month is more than a bargain.