Hello and welcome @IanManning 
If you’re community is closed to public registrations (and therefore safe from spam signups) then you can change the default trust level to TL1 and forgo the spam protection element that TL0 provides. You can also change tl3 requires days visited to ‘101’ to make it impossible to achieve, which would then leave you with TL1 and TL2 as the only automatic trust levels remaining.