Adobe illustrator Substitute

CorelDraw is still popular for folks running Windows

A popular newer commercial option is Serif’s Affinity Designer.

The free/opensource options include Inkscape, Cenon, Graphite, &c.

Depending on what you mean by:

program that can help transform illustrations into vectors easier.

Carbide Create may work well:

If you would provide an example of the workflow/files/approach you wish to use we might be better able to advise.

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