Not sure if "fix" is the right word because accents are fine. But if you're looking to record a bank and have it sound different I noticed a couple of things o u o9
~Some of your vowels trail into being diphthongs at the end, mainly the "o". Instead of abruptly ending it sounds like its turning into "Oooohhhhh/www" Like an english O like in "Go" "Oooow/h" There's no raw samples that you have up so it's hard to tell if it's been recorded like that, or if its a result of the notes transitioning.
-Remember to keep your mouth appropriately open as well as your throat, it will help with your vowels over all, no matter the language
~Another thing that could be changed to your liking are your consonants. Instead of being sharp, to the point and crisp, they're very aspirated. This is probably the "American/English" accent you get told. Try practicing making your consonants come from your tongue and or lips rather than your breath.
-For example. Instead of saying "te" with your tongue on your teeth, move it back a little and use the roof of your mouth. While doing this make sure your mouth is still open and your voice is projecting and not being hidden behind your tongue or throat, otherwise you'll have a new accent. Be sure to be quick and sharp, unlike english consonants.
-Your "tsu" is also a good example, be very precise and sharp. Listen to a few native tongues say "tsu" so you can get the double consonant sound, there are actually tutorials for this sound for those wanting to learn the language.
You can always experiment and see what works best for you and what you think changes your accent. I hope I helped ; u ;9