Hi Bub, and welcome!
Hmmm well it feels good to feel good, doesn’t it? It’s better than feeling bad? So then why ever feel anything other than good? If you can already do this, then great 
.
But also note that the feeling good of the felicitous feelings isn’t the ‘good feelings’ of the hypomania. Rather it’s a general sense of well-being. It’s different than being energized or zested-up or really motivated or into a project or task, etc…
“Morbid fear of negative emotions or triggers” isn’t actualism – indeed it’s silly to fear such things.
Ok, but instead of feeling bad in those minutes, hours, or days, wouldn’t it be, to put it simply, an improvement to life if you were feeling good instead?
What about those times when life happens and you’re unable to sleep, eat, and exercise regularly? Wouldn’t it be better to not depend on these things to be enjoying being alive? (Although of course it’d be silly not to do them if you can and they do promote your well-being.)
Also rather than the chances being minimal wouldn’t it be better if they were zero?
The drive/motivation to feel good isn’t sourced in insecurity, but rather in the PCE. In the PCE you see that life is automatically already intrinsically inherently enjoyable, without having to do absolutely anything for life to be that way. As you enter the PCE, it’s immediately clear this is a far superior way of being conscious than what came before. Right as the PCE wears off you already know what’s going to come, a reversion back to that less-than-supreme ‘being’. Once it’s already worn off it’s completely normal to totally forget how superior it is, haha, except at the back of your mind maybe, until next time…
But in any case, as you see how good life can be in the PCE, it becomes clear it’s sensible to aim for that and imitate it as much as possible. And that imitation is done via feeling good.
The up-leveling is also not sourced in insecurity. When you’re feeling good most of the time, you’re not insecure about feeling good – insecurity isn’t feeling good you see 
. But rather it’s that feeling great is better than feeling good… a closer imitation to the PCE. And since it’s better to feel great instead of good … … why not feel great instead?
It’s of a totally different nature than a ‘good feeling’ that you get while high, and chasing ever-higher ‘highs’, etc… that’s why in actualism you learn to carefully draw distinctions between “feeling good” and “good feelings”. They’re a different beast entirely, though easy to conflate at first.
Well if you’re consistently feeling good it’s not quite so transient…
About it being ‘egoic’ or transient or not, the idea is to enjoy and appreciate this moment of being alive, in and of itself per se (i.e. the unconditional), rather than constantly enjoying specific things that are happening (i.e. the conditional). Although it can never be 100% until actual freedom, you can be relatively unconditionally happy and harmless. It’s really more about removing the things that cause you to feel bad (i.e. seeing it’s silly to let X or Y or Z take away from your enjoyment) rather than adding things to make yourself feel good.
And in any case the standard is the PCE, where you see that life can be that way (unconditionally/not transiently), forever. And though a PCE starts and ends, we have reports of Richard and Srinath etc., who report that it is possible for life to be that way (i.e. how it is in the PCE), forever. So we don’t aim for something transient but rather something unconditional, an absolute if you will. It’s just that this absolute is the physical actually existing universe, and not the metaphysical Absolute of spirituality and Enlightenment etc.
The way I’d put it is that when what you call Awareness is experiencing something unchanging, it’s not an actually existing unchanging thing, but an illusory one that your ‘Self’ is generating. Ego-self may be gone but soul-self is still there. It came into being with your body and will die along with your body.
In a PCE you can see that this supposedly-unchanging thing disappears together with the soul-self, and what’s left is an experience of something that is actually unchanging – which I guess I could say is existence itself in a way, since it’s obvious that things are changing (this moves here, that changes to that over there), but existence always exists haha. This existence was here before your body came to be and will be here after your body dies.
Cheers, welcome again, and hope you find this useful!
Claudiu