Help a new 80, play style and endgame
First I recommend gearing up.
For a tank guardian there are three conventional gear sets to consider. Clerics, Knights, and Soldiers. (You can also run Zerker gear and demolish things, but you said tanky).
Clerics is power / toughness / healing power
Knights is toughness / power / precision
Soldiers is power / toughness / vitality
Personally I like Knights.
Check out this thread https://forum-en.gw2archive.eu/forum/professions/guardian/Guide-Hammer-and-Altruistic-Healing-gameplay
It has tons of details.
Check out these sites :
- Gw2lfg.com for finding groups for dungeons, you will have a much better time doing them now you are lvl 80
- gw2stuff.com for the timers on world bosses, and locations.
And going for some achievements, rare armor skins, playing wvw + pvp and trying out different builds is always fun!