Stumped on choosing new class
IMO go with the ele or thief.
What he^ said. Ele is going to be harder to master but it IS a pretty fun class. Thieves are easy, if a bit squishy, and very versatile. Thieves require a VERY mobile play style, so hit and run tactics. If that doesn’t work for you, definitely go Ele.
Use. The. Search. Function.
Do a challenge like me, if your bored with the guardian playstyle focus on picking an alt that is the exact opposite.
Can you give us more info into what you like doing? For example, if you wvw, ele is going to be dropping fire fields and lightning fields in a large group zerg, then most likely switching to D/D to play with the glass cannons in the back when you fight. Thief will be waiting around on the sides looking for somebody squishy/injured, go in, kill, stomp, retreat.
If you’re dungeon oriented your best bet will be guard, war, or mesmer
If you like to farm I’d recommend ele, war, necro