The confirmed way wey person goes fit uses store Bitcoin for long time na by using wetin dey call non-custodial Wallet E mean say na u dey in charge of ur Bitcoin no b exchange like trust wallet and Bule wallet be examples. If u don buy Bitcoin e dey safer to move am from exchange to ur own personal wallet.
TheTrust and Blue wallets are either not exchange or custodial wallets but non custodial wallets because it does still give you access to control your funds and keep your privacies all by yourself.
With both wallets, you have your keys and recovery seed phrases. The exchange will take hold of your seed phrase and only gives you access to login to facilitate on your transactions. If you lost access to your exchange wallets, you can only recovery it through your KYC required details. However, the exchange does still have control over your coins.
The risk about the Trust and Blue wallets is that... Your seed phrases are still stored online because they are mobile wallets that are always connected to the internet which keep it at risk to be invade by hackers
To keep of from such insecurity threats, hardware wallets should is the best or or preferably Air gap wallets which wallets and seed phrases are stored off-line which hackers nor malwares can not invade.