I live on the edge of the woods. Tons of deer, rabbits, etc. The only thing that 1) works reliably for me and 2) is safe and ethical (so not poison or the like) has been an enclosed wire mesh fence. I resisted this solution for a long time even though my neighbors warned me that a fence was the only workable solution, but it's the only thing I've found that really works in my situation and I wish I had done it sooner.

Other things I tried that did not work:

Repellents, both natural and synthetic including but not limited to deer blood, other animal blood, predator urines (tried multiple types and brands), soaps and bitter and/or spicy repent sprays and gels.

Fake snakes, fake predator models and even real predators (not uncommon for foxes and coyotes are to be seen in our neighborhood).

Noisemakers and motion activated lights.

Lots more.

I wasted a ton of time and money trying the above, not to mention all the time spent gardening only to have it eaten by our woodland friends. A fence just works and does not harm animals. It can look very attractive too and can be relatively inexpensive if you keep an open mind w/r/t materials and look out for good deals/craigslist.