Cant get to dashboard

I have been running wordpress with this site for months now. https://www.tradesdisplayed.com.au/wp-login.php

I can login with the correct user/password, but no dashboard comes up. and no error displays etc, just get a blank screen. Is there anything to determine how this is happening, or any fix, or easy way to re-install without messing up the existing site and pages that are already built???

Thanks in advance