You're fine. Why would you not be? You left 15 comments in the last month, and they were all upvoted. It doesn't even really have much to go on to rank you, but your rank is positive, nowhere near 0, much less far enough into the negative side that it would need to be to even be greylisted.
99% of Lemmy is made of acceptable citizens. That's a real number. Only 1% of the users that it evaluates, which is itself only a tiny fraction of the total Lemmy population, ever get blacklisted. You have to be very obnoxious before it starts targeting you. I can understand the worry that this is going to arbitrarily start attacking people because of some vague AI bot decision, but that's not what is happening.
The visualization of someone's social credit score just picks the 5 most impactful posts, it doesn't discriminate based on positive or negative. If you want to see what the red corresponds to on my graph, the most negative things I have done within the time window are:
They both contributed some red to the graph, I think. The red at the far right end is comments within this post that people are taking exception to.
It's possible. I think it's more difficult than people think. You have to do it on a scale which is blatantly obvious to anyone who's looking, so you're just inviting a ban.
One person swore to me that it would be really easy, so I invited them to try, and they made a gang of bots which farmed karma and then mass-downvoted me, trying to get me banned from my own place. If you look at my profile you'll see some things which have -300 score because of it. I welcomed the effort, since I'm interested in how well it will resist that kind of attack. Their first effort did exactly nothing, because none of the downvote bots had any rank within the algorithm. I gave them some pointers on how they could improve for a second time around, and they went radio silent and I haven't heard from them since then.