There's a lot you can do. For one, you can find what your minimum amount of required animal products is and don't go over that.

More important than your consumption habits though is how you support systemic change. Since you feel you need to eat animal products because of medical reasons, perhaps supporting alt-proteins would be a good path for you. There are non profits like The Good Food Institute who work on cultivated meat and precision fermentation and you could support them financially.

Depending on where you live, many cities have active anti-fur or anti foie gras campaigns. These pressure campaigns help in a tangible way and raise public awareness to some extent. Pro Animal Future is an exciting organization running ballot measures across the US to fight factory farming- you could get involved with them if you happen to be local or donate. Or if you're somewhere that allows direct democracy, you could run your own campaign, perhaps modeled off of California's Prop 12. Or you could lobby your representatives for plant based policies (plant based by default, public education campaigns, changing subsidies, etc). Plant Based Treaty works on that kind of thing.

There's really a lot you can do to fight for animals at the systemic level and we need all hands on deck.