Technically you can use anything for job networking, it’s not necessary for it to be"designed" for networking.
A Lemmy instance about your industry/niche could be a good place to meet people in your industry, and even hire ppl or search for ppl hiring.
Yeah for real I feel like if I log back into LinkedIn and update my profile I start suddenly getting more spam lol
As far as networking you’ve got the right idea, there’s no reason to rely solely on designated networking sites for it.
Start with literally anyone you know (close friends and family) and go from there :)