Is there only one way?

There are various items that have the power to resurrect another person, and you can collect a lot of flowers for a one time resurrection at a place in the Lands of the East.

There are a lot of ways to resurrect someone in-game, though I will not spoil any of the details here, there are players who has items that can perform resurrection, there are resources that lets you create your own, it can also be available as a reward from various quests, and lastly, there is also divine intervention, but this happens very rarely.

Several years ago we had an RPC whose role is solely to resurrect fallen characters, but the condition is that a player has to defeat its two guards from battles, but times have changed and the answers provided are the only ways so far.

Azull was actively working on ways to sessurect people automatically, you should look for this info in the announcements and update the answers here. There are various ways to revive someone.

There are multiple ways to get revived, however none should be easy. There are hardcoded quests that end up in you being revived, but also a variety of reviving tools other players might have acquired. Seek for help, explore on your own, eventually there is a way out of death. Some clickies do other things while you are dead. Look for clues on the forum, and ask other people about more specific tips on where and how to start your journey for revival. You might want to look for the Caretakers guild, they know much about death and revival.