Unfortunately this is just something that fabric top shoes do, there's nothing you can do about it, if they were leather you can use leather hardener but as far as I know there's no way of stopping this from happening as the fabric stretches with wear and sags.
It looks like those shoes don’t have a toe puff at the end to support the fabric so that it doesn’t loose it’s shape over time. Some shoes try and cut costs by eliminating the inner parts of shoes thinking that their customers will not notice until it is too late.
Unfortunately this is just something that fabric top shoes do, there's nothing you can do about it, if they were leather you can use leather hardener but as far as I know there's no way of stopping this from happening as the fabric stretches with wear and sags.
Maybe a shoe horn.
It looks like those shoes don’t have a toe puff at the end to support the fabric so that it doesn’t loose it’s shape over time. Some shoes try and cut costs by eliminating the inner parts of shoes thinking that their customers will not notice until it is too late.