Wouldn't I have better chances if I had 100T shares?
Nope, makes absolutely no difference at all.
Its like buying a lottery ticket every week and then expecting the previous week's ticket to matter on the current game, it doesn't count.
The only share that matters is the one that has a value greater or equal to the current network difficulty at the time that it is submitted. Then and only then will it mine a block resulting in the newly mined coins being distributed to the miner that found it.