You can't enter T7-T13 games until you hit level 70. Or was that changed?
I yesterday watched a guy being leveled on non-season, and they couldn't invite that lvl 1 guy before they went down to T6.
Might be different for seasons, but I don't think so.
u cant enter higher then T6 before u reach lvl 70
I saw a video in youtube 4 necros lving to 70 in 1h20mins. They make character , do CR then gamble and run to cube. Any bounty boss preffered zoltun or magda which are not too far away, just to get few items. After that they were just searching for cursed chest events and doing them till they hit 70. Making split games to find good ones. It might be a bit more tricky if u dont know which ones are not that far from waypoint. OFC lving up blacksmith, making lvl 70 2H weapon with cc roll, so can roll lvl reduc easier(just 3 stats instead of 4 ) and use it at lvl 40 hopefully. After equiping that weapon u can just run t6.