Well I think it’s important to recognise firstly it’s not realistic or healthy to be upbeat and happy all the time -all emotions have Their uses in the right places. It’s when they start persisting in the wrong places that problems occur. I aim for contentment and recognising the value of all more extreme feelings, but always try and think of what I can learn and grow from in each situation.
I focus on the ebb and flow of life. Everything is transitory, everything changes. Don’t spend your life swimming against the tide You’ll get tired and drown -trust where the sea of life takes you, learn to float, you might not end up at your intended destination, but the world is a wonderful place and you might end up somewhere fantastic. Sometimes that ebb and flow could turn into a tsunami-even so the waters will eventually recede.
Learn what’s important to you and prioritise that -see other things as filler in life, they might be necessary to physically do For physical survival but not worth your emotions.
Don’t carry burdens from past mistakes. I like Samuel Taylor Coleridge’s narrative poem -Rime of the Ancient Mariner it gives a good description of this. A sailor has an albatross placed round his neck to punish him for the crime of killing it, he’s on his own, in the middle of the sea except for the ghosts of the dead crew and evil sea creatures. It is only when he learns to bless all the good and the bad (nasty sea creatures) that he gets rid of the burden of the albatross. A very good analogy for trying to find the positive, no matter how bad the situation Or the monsters around you are. Otherwise you will carry the burden of your mistakes for eternity.
I personally find music, poetry, nature and reading about certain matters fuel my emotions and mind.
Diet plays a massive part, learn to listen to your body what food affects your mood and how.