I can tell you that one of the most intimidating things to me was/is the fragmented nature of said 'fediverse'. Between mastodon, lemmy, the video whose name I constantly forget and the other stuff going on... it's hard to keep track of what is what. It's even harder with the supposed portability/compatibility between various services (I have yet to understand how I am supposed to follow a discussion on lemmy using my mastodon account and vice-versa. Don't get me wrong, I'm fine admitting that's a me issue but still... it doesn't help me being more active and, to tell you the whole truth, I quit using my mastodon at all because I could not figure out out to use it hand in hand with the Lemmy one or even if it was possibility or I simply understood it wrong

I haven't felt the need to broaden my footprint in the fediverse beyond Lemmy. You are definitely correct that the interaction of the various services could be improved. Time will tell if they grow together or further apart.

And that's not even mentioning people like myself who also blog: can it be done inbside lemmy? Is it considered good practice or not to link back to one's blog? Since I can't tell, I refrain to share any link to my personal blog ;)

There are some using Lemmy itself as blogging software. It can be as simple as a community with posts restricted to moderators (you) or as much as an entire instance dedicated to a blog. The sky is really the limit and users are coming up with (I think) some use cases that even the devs didn't see coming.