Alright

Im not seeing anything on how far the stone can go back in time

Im pretty sure he could use it like if he heard about gamora dying he could teleport to where she died and then change reality to where the other people around her wouldnt be there so he could go back a little like dr strange did with the apple and how thanos also did when vision died/got ressurected

^In What If, Strange went back months to save Christine, so I assume it can go back as much as you like.

^Right i totally forgot about this thanks.

So that means thanos when he got the time stone couldve just went back in time and taken all the other stones

I don't think it's possible to get another stone from the soul world it's called that for a reason

If Gamora kills her self, Thanos wouldn't lose, he would probably get the time stone first and reverse time to when Gamora kills herself

I mean... Gamora did asked Peter to kill her. So I presume that plan would have worked.

Wait so you're thinking 'bout Gamora commiting suicide so Thanos lost? I think Gamora would do that, but it's too gruesome for the MCU!

She did try, but it was to late

Also Thanos would never let that happen. He’d find some way to undo it.