ATM DeepL is definitely the best Machine Translator that I know off.
There is however a translation model that works offline being trained by someone and it's looking promising. Currently beating Google, its being improved by the day.
More about the project here https://www.reddit.com/r/visualnovels/comments/pqh5wz/from_the_developer_of_sugoi_translator_and_vn_ocr/
If you wish to help out you can also join the discord https://discord.gg/XFbWSjMHJh