You can't close your account if you're using a non custodial wallet, both Trust wallet and Exodus wallet are non-custodial wallet.. you will get a seed phrase from  opening a non-custodial wallet so there's nothing like closing such account. If you don't have anything on those wallet and you feel like "closing" then you can just delete or discard any form of seed phrase or any item you safe the seed phrase but if you eventually find it again in the future you can still make use of it and still access your wallet.
It's worth knowing that Trust wallet and Exodus wallet are closed source i.e their code is  not available to the public