Play a new character is another choice, but it means extra monthly sub fee/go for six-month sub if same world, or play in another world where you have no house (assuming you have one)/FC members to play with. Let's not mention you also need to go through many expansions, or buy a boost + story-skips. All cuz you miss talking with a NPC.
If you pay the standard subscription fee ($15/month), you can have 8 characters per server up to a total of 40 on any server/data center. You don’t have to pay extra. Basic sub is 1 per world up to 8 total.