My deer lease is in central Texas (Lampasas county) and the first thing that popped into my head when reading your post was: you may find a ghillie suit to be too hot, especially late summer and early fall. I use an ASAT leafy suit (breathable mesh) and once the temps are in the 80s or higher, it starts to be a bit uncomfortable, even with just a t-shirt on underneath. It will probably still be in the 80s or even 90s when bow season opens. Just something to think about.
When using a ghillie / leafy suit, be sure to have something behind you that lets you blend into it. You can't rely on the suit 100% to conceal you. If you sit still, you'll have deer walk right up to you. But at some point you have to shoot, which segues into:
Work on drawing your bow with as little noticeable movement as possible. Even though you're wearing a ghillie, you still need to hide this type of movement or you'll get busted, so find natural cover that has 'shooting lanes' (I carry a pair of garden clippers with me at all times for trimming small limbs).
And as already mentioned, treat each outing as a learning experience. Everytime I make a mistake, I make a note of it as soon as possible (sometimes on my phone immediately, other times back in camp). I re-read those notes frequently until they're ingrained.
Looking at my phone, I still have some that I haven't transferred to a notebook. Here's one:
"Trim ALL firing lanes." I missed an opportunity on a huge 6-pt last season when the one 'lane' I didn't trim happened to be right where he ended up standing (I still remember sitting down and evaluating my shooting lanes and thinking, "Oh, nothing will ever come from THAT direction" /facepalm); I was eventually busted when I got impatient and tried to move to a spot where I might have a shot.