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You can stream I've Been Killing Slimes for 300 Years and Maxed Out My Level (2021) on Crunchyroll with a subscription.

After dying of overwork in the real world, I’m reincarnated as an immortal witch, and I spend 300 years enjoying a relaxing life. At some point, though, I end up at level 99! All those years spent killing slimes to make the money to pay the bills gave me a ton of experience points. Rumors of the level 99 witch spread, and soon I’m up to my ears in curious adventurers, duelist dragons, and even a monster girl calling me her mom! I’ve never been on an adventure, but I’m the strongest in the world… What’s going to happen to my relaxing life?!

After spending centuries avoiding stress by hunting nothing more than low-level slimes, Azusa finds her quiet cottage overrun by a chaotic family of magical creatures. This cozy fantasy trades frantic battles for the gentle joy of finding domestic bliss in another world.

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