Whatever is in the game right now, is all there currently is.
You cant get back the tangled shore, titan, the seasonal quests/activities like sundial or the Forsaken seasonal content like the forges, gambit prime etc
Read https://www.bungie.net/en/Guide/dcv
English
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Thank you for your response. I read up on the links that were in the other responses. I am regretting the fact I ever left for the time that I did. Oh well. Onward i go.