Well done on deciding to recognise your illness. It is a big step in healing.
I had depression for decades. It vanished about ten years ago and never returned. I decided to just focus on my health - mental and physical- for a year and prioritise it over everything else.
Things that worked:
Scaling back unnecessary commitments. If you do a lot of voluntary work or help family/friends etc more than you feel able to, just let them know that you have some health issues right now and are unable to continue with immediate effect. You might feel like a fraud, but you'll soon realise you aren't a fraud, as the stress drops and the energy seeps back. It was depleting you.
Going low-contact with my parents who, like yours, had no time at all for their children having problems - we were there to support them and our own needs got minimised. I had no desire to stir up drama with no-contact but I did explain I was unwell and unable to run around after them as much as I had. They quickly found someone else to be at their beck and call. When they behaved in ways that I had come to realise triggered severe depressive episodes in me, I just started walking away - literally making excuses to leave the room, the house, or leave early from visits.
I did online CBT worksheets on self compassion, self care, self acceptance, and other online depression exercises.
I started taking supplements - B complex, Vitamin C, iron, Vitamin D spray, magnesium, L-Tyrosine. You may not need all of these. Research what kind of depression yours might be - serotonin depletion or dopamine depletion, and experiment with topping up what your body might be low on.
Big increase in exercise - HIIT, yoga flow, bootcamps, regular walks in nature, swimming, rowing. And in mental health exercises, with daily meditation or affirmations and journalling - 10 minutes is plenty.
Trying new things - anything really, with no pressure on myself to continue or commit to something - I just had to try once. It felt nice to expand life a bit. You might find it interesting to try some tiny new thing each day, something a bit bigger once a week, bit more ambitious once a month etc. Everyday stuff is just things like trying new music, foods, routes to work, just to disrupt the depressive loop. Weekly things might be trying a new form of exercise or going to a local place that you've always meant to visit - a museum, or landmark. Once a month could be a small but challenging project like redecorating a room, going away for the weekend somewhere new etc.
there's no shame in medication. I don't know if all this would have worked without it. I came off it within a few months. But if you don;t feel ready to take that step, then trying any of the above that appeal to you might help shift it a bit.