I think you have to make things like this a way of life, not a quick fix.
In a normal week I might eat salmon twice plus I try to eat a tin of sardines ( on toast or in a salad.) I eat some kind of fish almost daily though not all has a good supply of omega 3.
I eat 2-3 small avocados each week, walnuts as a snack or mixed with apple & celery as a salad, and use olive or rapeseed oil on salads and in cooking.
I don't drink alcohol or tea or coffee- not out of choice but for a medical reason.
You also need to cut right back on sugar- it destroys collagen.
So far so good- am late 50s and no wrinkles but I have used sun block spf 25+ for 25 years too, every day.