I've tried using some of the Reddit forums that allow you to promote your posts, but haven't gained any traction from them. I also post regularly to Instagram (I have the main link to my blog in my bio) and have gained minimal traction there. I've been reading a lot about how people have gained major traction on Pinterest, but have yet to figure that out. I've gained nothing by posting to Threads or X. I have also recently joined the Blogarama community; but, I haven't been there long enough to report on my stats.
I've honestly gained the most traffic by engaging with other bloggers (reading their work and commenting on it) and participating in community posts (i.e. daily prompts, prompts from popular bloggers that allow you to post links in the comment sections, guest blogging, etc.).
I think it really depends on your niche and what your ultimate goals are -- for instance, I'm not aiming for monetization at this point and I'm a personal blogger who works mostly in memoir and fiction writing.
Anyway, hope this helps a little!