Any wallet you use will generate a backup "seed" (12 or 24 words) during setup and ask you to write them down. So it doesn't really matter if your electronic device/phone/computer/drive fails later. Because you can always import the same seed into a new wallet to recover everything. BTC is not stored inside wallets, they are on the public blockchain. Wallets are more like keycards that store your keys. And all of a wallet's keys are based on that backup seed.
The trick is to generate that seed in a safe way. Using a wallet you trust, and never letting the seed be on any internet-connected device. That's what hardware wallets make easy. So getting a Trezor (or any of the popular hardware wallet brands) is your best option. Realistically you can keep the BTC on CashApp while you wait to get your hardware wallet.
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