I'm not saying everyone should be vegetarian but for most people eating 50% less meat would be a lot more impactful than avoiding plastic packaging or imported veggies.
Most of the items you listed are necessary or can be made to have little impact, e.g.: >plastic packaging Agreed here, most of it is unnecessary. However, it is a systemic issue - buying goods (especially groceries) that do not come in plastic requires significant effort i.e. shopping at bulk food stores or farmers' markets. >cosmetics Sure, a lot are unnecessary, but I'd hate to go into work where nobody wore deodorant, showered, or washed their hands. >Non-seasonal fruits/vegetables Depends on the fruit/vegetable. Where I live in Canada buying non-seasonal/local is essential - otherwise I'd be eating apples 6 months of the year. Fruits and vegetables that can be transported by ship often have a lower impact than locally-grown. >Having pets Most pet food is made from by-products that would be wasted by the animal murder industry. I'm vegan, but as long as people eat meat (which, let's be real, they will) owning pets brings huge positive impact to peoples' lives, with little impact - as long as you're not feeding your dog steak.
Yes pets food is often made of secondary parts, but it's still an accelerating factor in fishing/animal farming (some suggest insects (https://en.wikipedia.org/wiki/Pet_food#cite_note-8) maybe), we also always forget the indirect cost and pollution, like the transport, the packaging needed to feed daily those 1 billion pets or so worldwide, and their other services, let alone side-effect like feral-cats, ... Yes in some cases pets are useful, but not all
For cosmetics, just see how uncommon has become a basic soap bar, which is however the most efficient cleaning product, and likely less polluting
Ok for fruits in winter, I can understand you as a huge fruit eater (I'm in the South of France), it's still a win-win to eat seasonal, seasonal fruit/vegs are much more nutritive. I think apples is not the best example as with a few variety you can cover the whole year, maybe not locally in Canada though, your gray Canadian apples are excellent tho
"We work jobs we hate to buy shit we don't need"
Want to feel less stress as work? Consume less. Want to have a smaller impact? Consume less. Want to have freedom to splurge on things that you do actually care about? Consume less.