NFT Airdrop - how to mint to a smart contract then send to others?

Question

How can I mint NFTs (ERC721s) and assign the ownership to a smart contract, then transfer them myself as an airdrop to others? I've tried approving myself, but setApprovalForAll cannot be called by msg.sender. So how can I either a) call setApprovalForAll from the smart contract instead of as myself or b) set approval for myself in some other way so that I can transfer the tokens from the smart contract? I would prefer to avoid making myself the owner and then approving the smart contract as I'd like the airdrop to be more trustless. If I am made the owner I could send the NFTs to whoever.

I would appreciate if anyone could share the right way to do this or let me know if my approach is wrong entirely. Thanks. I've shared a small snippet of code below. Also any other unrelated comments about my code and its style/function would be greatly appreciated, I'm new to Solidity.

// mints 50 NFTs at a time and stores them in this contract
function mintMemories(string memory _tokenURI) public onlyOwner {
    require(
        memoryCounter < maxMemories,
        "Already minted maximum possible memories."
    );
    for (uint8 i = 0; i < memoryBatchLimit; i++) {
        _safeMint(address(this), memoryCounter);
        _setTokenURI(memoryCounter, _tokenURI);
        // setApprovalForAll(msg.sender, true); ??
        memoryCounter++;
    }
}

Answer 1

You already have the mintMemories function to create the NFT and keep the NFT in the contract, so you just need to define a send airdrop function that only you can call and which can send the NFT in the contract to the specified person without any additional approval.God bless you😎

 function send(address to, uint256 tokenId) public  onlyOwner {
        safeTransferFrom(address (this),to,tokenId);
    }

Answer 2

the answer from @zmy makes sense. I can't comment yet because of my rep, so I'm writing separately.

in this code of the other answer:

function send(address to, uint256 tokenId) public  onlyOwner {
        safeTransferFrom(address (this),to,tokenId);
    }

even though the msg.sender is calling the function send the transferring is done by the contract and not msg.sender. And as the contract already owns the tokens. no problem here! :)