My mind's always been my playground in a way, so spring cleaning comes by quite often and I really enjoy seeing in other people the 'quality' to do the same. I'd say ISTPs in general, although my INFP friend sometimes makes me think otherwise(Her internal world is super healthy, she even makes fun of her negative thoughts to kind of diss them).
I'm probably the least stressed person I know barring the one INFP friend who can just day dream all day and be content with that...
I could totally do that too but after a while(a very short one) my brain tells me I should be doing things instead of loafing around :/
I find stress eases with the appreciation, feeling of connection and love of all things that just are. It could be anything from watching the water in your glass sit silently, the leaves brushing against each other to the wind, the depth of emotions in music or the warm gaze of sunlight. So I guess stress, at least for the majority of people, comes from the focus on the other side of things, things that are lacking and shouldn't be what they are.
Anxiety is a bit tricky, I still feel it when I'm my most spontaneous and confident but effectively push it back but it helps to keep account of the times where similar situations have been successful and the things that your subconscious thought might happen never actually happened(You'll have to dig these things out to calm them down, I assure you there are bucket loads, your subconscious always seems to find something new to fret over).
As for depressed I just make sure I never go completely stone cold inside, bad things happen when I can't tell how I'm feeling or I'm attempting to suppress it. I've learnt to act in ways that disregard how people 'should' act when they're feeling certain emotions rather than say, tell myself that being nice while angry is wrong(using my individuality I guess, a recent addition to repertoire).
As for general neuroticism, I'm pretty sure I'm the least neurotic person(From me and my friend's point of views) in terms of negative thoughts. It's a matter of settling the score for emotional turmoil, acting on those feelings rather than ruminating(emotions are impetuous and wreak havoc internally if not expressed(Fe)) and holding yourself accountable for all your thoughts instead of seeing them as uncontrollable. I do think for hours about doing nice things to show my appreciation for people or helping them with their problems in numerous ways but I also act on about half of them, they just seem to stream and play themselves out rather than me getting stuck in any one of them though
So yeah, I don't think it has anything to do with MBTI really, it's just a matter of creating positive self-delusions that also don't go against your principles/values or even reshaping your principles/values to better be who you would like to be. Some things are hard to change though, such as a history of childhood trauma... it's getting better(quite quickly I think).
