OK, so if I take a step back, your question comes from a good place. You recognize the risks and complexity of your Android.
You're recognizing the risk of running some bad code which manages to bend the system to trick it and/or you to do take some destructive action or expose and extract some information.
So you're looking for a new application which could then detect and protect you from these threats. You can't really get that much more secure by bolting on a new part on top of a fundamentally insecure and leaky foundation. There are some better approaches.
You can look for a more secure foundation. Which Android device and ROM you use make a big difference.
GrapheneOS [nofollow] comes highly recommended and is a huge step up in security from most stock ROMs. It locks things down a bit more to protect against those kinds of exploits.
Second, separate your domains. Everyone talks about hardware wallets, and those can be great. But maybe you really shouldn't be browsing random sites on the same device that holds access to your crypto funds in the first place? You could get a new device (like an old Pixel 6 or sth) and keep that dedicated to your crypto dealings.
Third, practice basic OS hygiene on at least your important device. Remove old apps you don't use or recognize. Stay on top of OS updates. Don't sync or backup sensitive stuff on Drive or other clouds.