Much of what has been mentioned are good tips to experiment with. It's really all about finding something to keep you progressing. If you plateau then you aren't growing and finding something different can keep you engaged while you work on your craft. I have done a little bit of much of that: blank bailing, long range, video taping and each has something to help with an aspect of form.
As far as your considerations:
A bigger barrel on my thumb button.--Very specific to each person and hand, finger size and how you wrap for the trigger. I used a 3/4 brass for my thumb because it felt more natural for me. This is super subjective. It's all about consistency in my opinion. You want something that will be easy to find and create repeatability. Nothing is worse than reaching for your barrel and then it feels strange, off, ect and you have to keep adjusting to find that "right spot." This is very true for a hunting situation as you have less time to fiddle around and often can't let down and re-draw to start the shot process over.
Putting a dot or something textured on the front of my riser as a marker for a more consistent grip--I never did this, but I know some bows are even machining out a groove in the riser for this. I practiced for a while not touching the front of the riser at all. Try holding a pencil, chap stick, or bow wax tube in your 3-4 fingers of your grip hand. It keeps your fingers from getting too grippy.
Grip tape on my release. I’ve seen and read about this but never tried it.--I had a release I bought that had this pre-installed. I had two of the same release. One with the tape and one without. If you have trouble gripping the release try it out. I will say I didn't notice a huge difference comparing the two. You may find it makes your shot worse as the grip tape can grab your fingers at angles a smooth surface wouldn't. It essentially it could act as a fulcrum. If you squeeze your fingers when holding the release and have more tension in your hands the tape can catch and you end up with more medial or lateral pressure on the finger grooves and it can pull the release away from your face rather than straight back. This may be more exaggerated if you shoot with gloves as the fabric may catch/bunch in ways that your skin will not. I noticed this more of an issue experimenting with groove and finger positioning (I.e deeper verses shallow and more closed fisted). Without tape my fingers slide into a settled position versus catching on the tape at an obtuse angle. Using tape I had to be very intentional with how the tape felt on my fingers. It's not a big deal and you can adjust to it for sure, but it's something to think about. You also have to consider weather effects. Some tape peels in extreme heat, cold, or humidity. It may also attract dirt being tacky.
8 degree QD for front stabilizer as opposed to current 0 degree--I use an 8-10 degree on my stabilizer now and prefer it over the straight 0 degree. The 8-10 degree down will change your float. It becomes more of a figure eight pattern as you drift around the target. This may or may not be to your preference. Compared to a straight stabilizer the down angled QD's will effectively act like a shorter stabilizer bar, it's not a lot but it brings the balanced end closer to the bow. So a 15 inch stabilizer with a straight QD will extend farther from the bow compared to the same 15in stabilizer with 8-10 degree QD. As a general rule the longer (farther from riser) the stabilizer is, the easier it is to create balance and the less weight you need at the end to establisher that balance. Does this matter a lot? It's all preference really. I like the 8-10 degree down as it floats more preferentially and I like that the weight of the stabilizer is also at a lower center of gravity.
I know that was a lot

It's all my own experience, everyone else may have a different perspective which is always appreciated.