Oh man, I'm tweaking my entire system this season. I learned TONS from this past season and aim not to make those same mistakes (knowingly) again. My main changes summarized are...
More peppers, all the peppers. Starting them indoors a full 6 weeks earlier as well.
Expansion of the fence line garden.
Expanding my flower residency to incorporate closer to 20% of the garden, vs. the 5% last year.
Amending my irrigation system. (I believe I have one too many lines per bed and will subtract one.)
Redesigning my trellis systems and adding/subtracting trellis from plants. (last year I had a trellis on my squash and zucchini beds for some reason, it was NOT needed)
Adhering to spacing more strictly. (I let my tomatoes run wild and I suffered with a weaker crop yield. Ooooh did I have the vegetation though!!)
More fertilizer, more compost.
Implementing the "3-sisters" method HEAVY this year, as it absolutely thrived last year with my trial set of 3.
Herbs, herbs, herbs.
Starting over with all new and fresh seeds. (I aim to narrow down why things aren't working specifically. I was using some seeds that were up to 3 years old with almost zero germination at times). I bought $140 in seeds this year.
NO OUTSIDE STARTERS. (I was out of time and needed replacement plants. I bought some $1/2 starters off of the marketplace and I believe they introduced foreign species and disease to one of my beds.)