So you're advocating screwing over the investors from the first accelerator? Especially after they guided the startup to a potentially successful pivot?
If your new business plan is encumbered by associations with the previous "pivot" (usually: because you share code with it), then starting fresh is problematic.
But if it's not, if the only thing that's the same with the previous pivot is the team, and iff you haven't worked on the new business plan using resources from the previous investors, then "pivoting" gives your previous investors equity in a business they had nothing to do with starting.
If you were (a) about to run out of money anyways after giving it an honest shot or (b) returning money back to the investors, there's nothing wrong with dissolving old-co and starting new-co with a clean cap table.
If your new business plan is encumbered by associations with the previous "pivot" (usually: because you share code with it), then starting fresh is problematic.
But if it's not, if the only thing that's the same with the previous pivot is the team, and iff you haven't worked on the new business plan using resources from the previous investors, then "pivoting" gives your previous investors equity in a business they had nothing to do with starting.
If you were (a) about to run out of money anyways after giving it an honest shot or (b) returning money back to the investors, there's nothing wrong with dissolving old-co and starting new-co with a clean cap table.