If you get tired of the grind, just stop playing. The game isn't going anywhere [yet]. Your stuff isn't going anywhere (unless it's in your mailbox - that gets cleared out with inactivity). If you're gold, just cancel the sub before you stop
LTS and silver players can just start right back up in a few weeks/months. I've done it two or three times.
If you make a leveling mistake, you have to pay to fix it.
How many games let you fix leveling mistakes at all