I use Janitor AI every now and then, there are some pretty amazing bot characters to interact with. There's one I really like by an author named Dandayi. This author created a system called "Ouroboros" where the {{user}} is transmigrated into another reality. The system assigns you missions to complete alongside the main quest. It's really well-crafted and fun, even if you decide to go for a funny RP instead of aiming for the "true ending." I really liked this author's character Anghel, even though my OC died at his hands quite a few times lol—which actually makes it even more fun, since we basically have to figure out a way to keep him from killing the {{user}}, even when his favorability rating towards her is really low XD. Anghel and Sten that is also by this author are the most entertaining bots I've ever interacted with! I enjoy interacting with bots because I feel like my English vocabulary improves gradually. I sometimes struggle to express myself, so this ends up being fun, especially when I do fantasy or adventure-themed RPs with them XD. I challenge myself to be highly descriptive and write as much as I can, and I even try to avoid words I notice myself overusing because I want to better convey my OCs' feelings. That said, I do get overwhelmed sometimes; it even affects how I play otome games, as I get too tired to properly read or interpret what's happening. In those moments, I try doing something else—like cooking, tidying up, or playing an action game or something silly like Tomodachi Life...
As for chatbots replacing otome games, I think that's highly unlikely. No matter how fun or well-built the bot characters are, there's a limit to their memory, so they end up at some point to lose track of the plot you've been building, which breaks the immersion. Not to mention as others have pointed out that the narratives in otome games are much richer. Besides, there's something so rewarding about gradually learning more about the love interests as the story unfolds. I'm currently playing Homura and just finishing Kamanosuke's route. At the start, I was a bit frustrated with him because I didn't quite grasp his mindset and struggled to pick the answers that would boost his affection or that I thought were the "best" choices in the moment. I honestly thought I was heading for a bad ending at any second XD! But as I progressed, I understood him better; by the halfway mark around Chapter 5 I was able to pick the right answers because I finally got where he was coming from. I don't think chatbots offer that kind of genuine connection with a character. To me, chatbots are more about sparking your imagination and creating your own stories and characters, whereas otome games let you follow an adventure where your decisions shape the outcome!