OP, there are always posters on ME/CFS threads who have miraculous recoveries from psychiatric approaches or positive thinking. I’d be wary of getting caught up in this. ME is a neurological disease and is classified as such by the WHO.
If someone recovers by simply changing their mindset, it’s highly likely they have/had some sort of mental fatigue, not ME. It fuels the stigma.
Obviously someone who wallows and allows ME to define them is going to have less hope of a positive outcome than someone who actively tries to get better; this can be said of any illness.
Listen to your body, if it needs to rest, it’s not you failing. If you rest, you will come out of the dips more quickly. Stay as active as possible but within what you can manage without pushing yourself in to a crash. Mindset is important, but it’s not the cause or a factor in whether you will recover or not.
Pacing is vital but frustrating, but Post Exertional Malaise is your body telling you that it’s beyond your capabilities with the energy you have. Look up spoon theory, cheesy but useful in understanding how your energy works. Prioritise what you need to, let go the things you don’t.
Find easy, small activities you can enjoy on the bad days. If you listen to your body, things can improve and fluctuate over time.
I have had moderate-severe ME for over a decade; I lost everything to this disease but I manage it well and I still look forward to things in life. I spend time with my family with adjustments in place. I’m a positive person but I know my limits and whilst I do push the limits, it is only when I know I have the chance to recover. It’s not always like this, when I have weeks on end of dips, it does get me down (and it’s fairly regular this happens) but I know that if I listen and rest, I will feel more able soon .
Life with ME is hard. It’s a spectrum and not everyone will be affected in the same way, don’t compare. If your neighbour’s friend’s auntie has been diagnosed with ME but is working full time, paragliding at weekends and going to the gym 8 days per week, I can guarantee you they do not have ME.