In that case, all you need to do is rename your current arm9loaderhax into arm9payload and put that into your anim folder
Then put BootAnim9's arm9loaderhax bin on the root of your sd card along with arm9bootloader bin
Something that you might want and/or be interested in is gnmmarechal's Quick payload switcher. Some games that require more ram such as monster hunters will not boot if you have the bootanim9 payload. with this, you can switch between the two from your home menu. I find it very useful. Here is the link to the thread: https://gbatemp.net/threads/release-quick-payload-switcher.432358/
Something that you might want and/or be interested in is gnmmarechal's Quick payload switcher. Some games that require more ram such as monster hunters will not boot if you have the bootanim9 payload. with this, you can switch between the two from your home menu. I find it very useful. Here is the link to the thread: https://gbatemp.net/threads/release-quick-payload-switcher.432358/
Last I read Amazon owns some rights you'd think a billion dollar company could fork more over for a decent game but their last game bricked GPUs so theirs that