You can do both actually! Use quppy wallet (availbale both in App Store and Play market) for secure storing your crypto and withdrawing it to fiat once needed. Wallet offers you an opportunity of opening an account in EU bank with personal IBAN. This way you can easily fix the profit and buy back cheaper of needed within a wallet
I guess KYC obligatory for that purpose, right? I wish there was a service to do all that staff ( depositing and withdrawing fiat) without KYC procedure