I think the pursuit of enjoyment is a mistake, just as I think too much ambition is also a mistake.
What is crucial is inner peace, and contentment.
Neither of these to really can be found entirely within one's self so much as in gentle interaction with and generosity towards other people.
Selflessness is the greatest gift one can have. That does not mean you become totally abstemious of fun or enjoyment, but rather that one takes things in moderation. One may smoke a roll-up, and so what. Smoking sixty a day is ridiculous! One may take a beer or two, but ten pints a day is plain stupid.
One may eat red meat, but once or twice a week would be entirely sufficient.
Moderation in all things rather than cast iron abstention is a reasonable route. Kindness to others, even if you actually don't like them. It is amazing what can come from it. The grace of politeness makes even the toughest day easier, and over time it brings respect, which I happen to believe is the firmest foundation for lifelong friendship. It is a commitment of respecting people first and foremost, even those one does not like as such.
Of course it is not just a good thing, but actually essential to try to live a life that does not cause harm to others, but that is also like good manners and comes from respecting others - friends, those one knows who are not actual friends, and complete strangers alike.
Now can anyone live up to that philosophy, every single day? Nobody. Anyone will slip from it from time to time. It is the striving towards it that is crucial.
Unfortunately this attitude is far from fashionable, or perhaps even normal these days.
Best wishes from George