I have lots of advice on this as I am someone who is lucky enough to experience bad withdrawals..
Trust your body more than your doctor. My doctor wanted me to go from 100mg down to 50mg, then down to 25mg, then stop. I felt that was too much and went from 100mg to 75mg and had horrible withdrawals (nausea, black outs, vomiting, diarrhea, dizziness, fuzzy head, depression, anxiety, and lots of suicidal thoughts). I did a TON of my own research, watched tons of YouTube videos around the science of serotonin, and chose to call my doctor to switch the wean schedule. It took a long discussion about how it's my body, not hers, and that I would go find another doctor if I needed to in order to get off Zoloft without killing myself. She finally listened and I am currently weaning and am going down by 12.5mg each time and letting my body tell my when to wean next.
Look into 5HTP. Essentially 5HT is serotonin and 5HTP breaks down into serotonin in your body. 5HTP can come with its own withdrawals, but can be very helpful to alleviate the withdrawals from Zoloft. I get this brand from Amazon and have it on auto delivery so I don't forget to buy more. I take one pill in the morning and one in the evening from a day before I start my next wean to until my withdrawals seem to be almost gone. Then, I switch to half a pill in the morning and half in the evening. Even after the withdrawals seem gone, I still have depression and anxiety flare ups and this helps keep them to a minimum.
Diet and exercise are HUGE. The Mood Cure was reccomended toe by my clinical psychologist, along with 5HTP, and both have helped. Protein helps tremendously with your mood. I try to get about 75mg of protein each day. Fruits and veggies are super important as well. Exercise is helpful for your mood even if you're not weaning. This book is worth a read for anyone.
Lastly, sleep and rest. Your body is going through A LOT during weaning. If you've done research into serotonin production and use, you'll understand that your body is out of whack and trying to figure itself out. Rest and sleep with help your body to do this. I plan my weaning around weekends. I go down on a Thursday so my worst days start on Saturday. I can take the weekend to rest and sleep as much as my body needs. I still get exercise in, since it's also important, I just do something less intense so I don't deplete my serotonin.
Good luck to anyone going through weaning. It's very difficult; don't let anyone try to tell you otherwise. Some people get lucky and don't have many withdrawals, but since they've started studying withdrawals (around 2019), they've found at least 60% of people experience withdrawal symptoms. You're not alone in this.