make lines thicker on already drawn object

[Krikor]

(04-01-2022, 01:49 AM)vespa6 Wrote: Can someone please explain this in a bit more detail, I have tried and cant get it to work - Im new to gimp, still learning, thank you

vespa6,
Without further details, it's difficult to know what your difficulties are.
Maybe you don't know where to find the filters used, in this case:

Gaussian Blur, you can find it through the menus: Filters - Blur - Gaussian Blur.... At first try the default values.

Curves tool, you access this via the menus: Colors - Curves.

If you can give more details of what you are trying to do and where you are having difficulties then it would be easier to give you some more objective assistance.