Redoing the election only takes pressure off Maduro. It’s an empty gesture to appease the opposition for a time, which just gives Maduro room to plan for stealing the next election. And it drags things out for longer, which can easily cause some of the energy to be drained from his opposition, because movements like this tend to fade out after a while.
And what could possibly be the point? If he won’t concede this time, next time won’t be any different.
Better to keep putting as much pressure as possible on Maduro and his regime. No reason to make hanging on to power any easier for him, and even if he can’t be convinced to bow out gracefully, if things get bad enough for him, the decision might not be his to make.