Toe space in my Converse (Chuck 70 Plus High) is too narrow. Any way to make more space there? I can even pay for this

I love how these look but the toe space is definitely too tight. It was not even about the size because I was trying bigger ones but they were still too tight and also too long so I've decided to choose my size (using length in cm, not the size number). Because the toe space is to narrow the shoe rubs my heel painfully after wearing it for a long time. Also my foot itself is considered rather narrow than wide so I don't really know why they make those shoes so narrow. There is no correct size for this model (and I have a lot of other Converse shoes and none of them has the same problem) so I'm even willing to pay for fixing them but maybe there are some diy ways I couldn't find.