Kbin isn’t really a “frontend” in terms of being just a UI to access a Lemmy instance. Kbin is a different federated app, like Lemmy, Mastodon, Pixelated, etc. What makes kbin uniquely similar to Lemmy is that it’s UI is community/forum oriented like Lemmy’s is. And it’s supposed to be compatible with Lemmy federation-wise, so you can subscribe to Lemmy communities from a kbin instance. A few days ago kbin was like maybe 2% of the size of the Lemmy community though, so a lot of what you’d do on kbin is subscribe to Lemmy communities and talk to Lemmy users. I decided to just use Lemmy natively to eliminate the possibility of incompatibility.

A kbin instance though would be a different instance, and you’d need a new account on it to use it. And if you want to reduce load on lemmy.ml really all you can do is use Lemmy less or abandon this account and create a new one on a less busy instance (either Lemmy or kbin). But honestly if lemmy.ml is working, I’d just stay there. With the crazy flood of new signups, server hopping and creating dupe accounts is as likely to make this worse as it is to make them better. You’d also lose all your subs and post/comment history. There is a ticket for account migration but it’s not done yet so you’d truly be making a brand new account with no link to your existing one.