Happiness means different things to different people. Like the saying goes, one person's rubbish is another person's treasure and that is perfectly fine. Take time to know what makes you happy. Maybe reading, listening to music, socialising with friends, gardening etc.
whatever your happy is do more of it.
Firstly, be kind to yourself. Sometimes we often treat ourselves not very nice. Being critical of ourselves and thinking ourselves into a low mood and out of happiness.
forget about regrets. It achieves nothing other than a waste of time, energy and mood. Learn from it and move on.
self-care such as aromatherapy. Burn a few essential oils in your home or add a few drops to your bath such as -
Lavender Oil. - reduces stress and anxiety and has a calming effect
Bergamot Oil.-Commonly used in aromatherapy to elevate mood and alleviate stress
Jasmine Oil.-Antidepressant. There is evidence that aromatherapy can effectively reduce depressive symptoms.
Basil Oil.-enhance mood, improve digestion, increase alertness, and soothe muscle aches. Basil essential oil is also sometimes used as an insect repellent