>>2910767
As you can see in the picture, that is a wire stripper. The crimper function is specifically for crimp terminals with color labeled insulation like pic related, and it's not especially great for that, either.
Buy an IWISS crimper from aliexpress, they are a reliable very-budget brand.
https://www.aliexpress.com/item/1005006102116399.html This has precision machined die and is swappable, so you can buy other types of crimping dies for it. Also have it in kit with those plastic wrenches for mc4, though you can buy them separate just as well https://www.aliexpress.com/item/1005006226476510.html