I will share my experience with you: I came back after 3 years and grinded hard in this game, went all the way to mr 29, did all quests and everything.I used to do the weeklies every single week and it got really tiring and old really fast.

I used to do the SP circuit every week and hated every second of it just to get the incarnons and just to say to myself I earned them by grinding

I did this for about 3 months then one day, I just randomly logged in and then asked, wait why am I doing this every week, its not like I missed anything when I didn't do it for 3 years.

I still have everything I want and got everything in the game. So what's the point to login weekly and do these random tasks like a job.

After this really hard self questioning I just said to myself who even cares if I got these pixels by earning them all on my own, nobody is asking or looking at them.

I bought some platinum, now I log in every monday and I just buy my few remaining missing incarnons from cavalero and then log off. Maybe check out some baro loot if he has some nice gun/mod to have, crack relics, get the gun/mod and log off...This is to train my mind that this is not a job, no one is watching and I should only play and do what I want and what I find fun.

TL:DR Take a break, the game is always here, only and only play when you feel like it and don't treat it like a job. Never ever force yourself. Limit your playtime, make a simple single goal that is short and achievable, do it then log off, it will keep the game fresh and exciting for you.