var result = DoSomething();
result.OnSuccess(() => DoSomethingElse()).OnFailure(() => LogFailure());

public Result<T> OnSuccess<T>(Func<Result<T>> func)
{
    if (!this.Success)
    {
        return Fail<T>(this);
    }

    return func();
}

public Result<T> OnSuccess<T>(Func<Task<Result<T>>> func)