@monkeyonthetable you're 100% right that was most definitely depression (no shit Sherlock) and if that's not there then that's fantastic. Really pleased for you. 
Actually I'm the same. It's like the depression has just damaged the part that gets me doing things. Though I do run a company so I suppose it's not completely damaged. I do find the alpha stim enormously helpful too I must say. Not for motivation but definitely for mood.
Re hallucinogenics I know you can could go to the Netherlands to do it too - I think when you're tripping they talk to you and manage it in a certain way. I'm not at all risk averse but wouldn't want to be off my head without someone who knew what they were doing. Plus they are therapists and I'm not sure doing it without that would work.
Ayahuasca is a more heavy duty version of the same thing. Not sure it's better though. TBH I've not found a conclusive way to do it. Other than getting on a trial which isn't happening!
If I could get ket and do it in company (as in someone that has done it too) I would. Takes several sessions but a lot less trippy. Don't think you need a therapist there either!
Diet has made ZERO difference. Not having a total prick in my life has probably been the biggest factor in getting rid of it. At the end of the day if your life is stressful nothing really works and all pills go is help you cope with the shit-ness of it. Which sometimes you need. Prozac gave me an incredible boost. I went from rock bottom to great new career and social life in weeks.
Exercise works but only while I'm doing it and I don't have the motivation. I tried meditation (properly) and it did little. Ultimately you have to do 40+ mins every day for at least a couple of years. Therapy has been a waste of time and money though cbt might be different.
Cutting coffee or booze out makes no difference. In fact not socialising and not drinking makes me miserable AF. I've no desire to give up my social life or drinks with friends. In fact I'll go out every few weeks and get plastered and afterwards it's like a reset. I just feel so much better. I have some boozy holiday friends and always feel great during and after (though I'm tired after 2 weeks of 3-5am nights, apart from our one or two 'early nights of about 1 with only a few drinks). I'd rather feel alive and like I'm living instead of sitting around eating quinoa personally.