I have kind of a long last name and combined with the fact that many have said to only use .com for professional purposes (general public isn't so familiar with

I have kind of a long last name and combined with the fact that many have said to only use .com for professional purposes (general public isn't so familiar with many other tlds), I do: firstname@firstname[first character of my last name].com Although... I do have firstname@sdan.io but unsure how "professional" that is, so I use it for other newsletters/subscriptions