AES-GCM encryption in .NET Core

I created a crypto service using AES-GCM in order to encrypt the sensitive data in database. Firstly, I'm generating a cryptographic key from a password (probably will be stored in Kubernetes Secrets) by using Rfc2898DeriveBytes. Then passing this key to AesGcm instance. You can find the implementation down below.

public class CryptoService : ICryptoService, IDisposable
{
    private readonly AesGcm _aesGcm;

    public CryptoService(string password, string salt)
    {
        byte[] key = new Rfc2898DeriveBytes(password, Encoding.UTF8.GetBytes(salt), 200000, HashAlgorithmName.SHA512).GetBytes(32);
        
        //Gets securely random generated encrypted data encryption key from Azure Vault.
        string encryptedEncryptionKey = AzureVault.GetDataEncryptionKey();
        byte[] encryptionKey = AzureVault.Decrypt(encryptedEncryptionKey, key);

        _aesGcm = new AesGcm(encryptionKey);
    }

    public string Encrypt(string plainText)
    {
        byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);

        int nonceSize = AesGcm.NonceByteSizes.MaxSize;
        int tagSize = AesGcm.TagByteSizes.MaxSize;
        int cipherSize = plainBytes.Length;

        // Combine for easier encoding
        int encryptedDataLength = 4 + nonceSize + 4 + tagSize + cipherSize;
        Span<byte> encryptedData = encryptedDataLength < 1024 ? stackalloc byte[encryptedDataLength] : new byte[encryptedDataLength].AsSpan();


        BinaryPrimitives.WriteInt32LittleEndian(encryptedData.Slice(0, 4), nonceSize);
        BinaryPrimitives.WriteInt32LittleEndian(encryptedData.Slice(4 + nonceSize, 4), tagSize);
        var nonce = encryptedData.Slice(4, nonceSize);
        var tag = encryptedData.Slice(4 + nonceSize + 4, tagSize);
        var cipherBytes = encryptedData.Slice(4 + nonceSize + 4 + tagSize, cipherSize);

        RandomNumberGenerator.Fill(nonce);

        _aesGcm.Encrypt(nonce, plainBytes.AsSpan(), cipherBytes, tag);

        return Convert.ToBase64String(encryptedData);
    }   

    public string Decrypt(string cipherText)
    {
        Span<byte> encryptedData = Convert.FromBase64String(cipherText).AsSpan();

        int nonceSize = BinaryPrimitives.ReadInt32LittleEndian(encryptedData.Slice(0, 4));
        int tagSize = BinaryPrimitives.ReadInt32LittleEndian(encryptedData.Slice(4 + nonceSize, 4));
        int cipherSize = encryptedData.Length - 4 - nonceSize - 4 - tagSize;

        var nonce = encryptedData.Slice(4, nonceSize);
        var tag = encryptedData.Slice(4 + nonceSize + 4, tagSize);
        var cipherBytes = encryptedData.Slice(4 + nonceSize + 4 + tagSize, cipherSize);

        Span<byte> plainBytes = cipherSize < 1024 ? stackalloc byte[cipherSize] : new byte[cipherSize];
        _aesGcm.Decrypt(nonce, cipherBytes, tag, plainBytes);

        return Encoding.UTF8.GetString(plainBytes);
    }    
}

Here is my question. I am wondering that if this implementation is secure enough since I am not an expert in security. Am I missing a point or security hole except password security? Any advice and suggestions would be greatly appreciated.

Thanks.