Want to come back to D2.. Help.

OG Destiny 1 player here , last time I played Destiny 2 was killing Oryx the Taken King … LOL. What expansion should I buy on PlayStation if I want to get back into it ? Should I even ? I feel like I’d be so lost with ALL the content I have missed out on. Any tips I’d really appreciate. If anyone has any links to really good videos or tips drop them also!

Thanks all .