According to your lodestone you dont have a level 70 character. I would advice you to do the Main Story Quest for your first class and level the other classes this way.

What I do for leveling my DPS classes (as a healer or tank you get instant --- 5 min wait time in queue anyway), is:

- Do daily roulettes, everything, but Frontlines and Expert.

- Complete the FATES, Dungeons and Guildhest challenge log.

- Queue for dungeons and while you are waiting go do FATES.

- Do the daily Centurion Hunts, they give decent experience and as a level 62 with 270 gear you can easily kill the level 67 mobs. The only one that I could not kill were targets in The Loch.

- Always have the FC buff on and always eat food for the 3% experience bonus.

- Rest in zones with the moon icon for rested experience bonus.

I hope this helped.