Would definitely want to hear what sort of creative and impactful way you have in your mind , would might help BAS too.
The thing I have in my mind is that players stats get boosted or reduced due to match situation triggers instead of just flat boost or reduction without any event triggering.
So, simply, I'd expand proficiencies - make them relevant to particular formats and styles of plays. The point being they lead to clear batting, bowling, captaincy, fielding roles with their own distinct advantages and disadvantages. It could potentially influence other systems such as AI selections, auction picks etc.
I find situational impacts (new ball, powerplay), things that impact the mechanics of the game (timing windows etc) or how we approach the game more interesting. A perk that gives 5 extra Drive skill points isn't something that engages me to strive for. But a perk that makes batting easier to a particular type of bowler does.
Similar to what you have listed (New Ball bowlers, Strike Bowlers, Death Bowlers etc). But rather than just a single perk I'd have them be more defined skill paths or boosts/perks/stregnths associated with a role. So, in career mode, you can follow a path in its entirety and become the best New Ball bowler you can be, or mix and match to gain a broad set of skills.
Take, for example, a Strike Bowler like Mark Wood.
He bowls short spells, high pace, aggressive lengths. So, you want strengths that can be levelled up that could relate to:
Bowling speed
Maintaining high speeds; could be a strength that lets you use double the effort balls of a 'normal' bowler. Could be mechanic like 'Burst' strength that gives you four overs of express pace bowling but anything beyond that can cause a massive drop off in stamina and potential injury. 'Burst' might be cool down period, that means you can't do this more than once a session.
Things that relates to short bowling - increased precision with bouncers, so you timing window for bowling 'Short' is less restrictive, but you timing window for say good length is narrower.
Likewise with batting I think have more distinct gameplay influences. AI batters with more unique play styles based on their role rather than just five mentalities would, hopefully be interesting.
Most of that is easier said than done though.
Comparisons will be made, there are no excuses to have limited set of shots in today's time, you can get triggered/defend, playing with AI you need freshness.
I'm guessing here, but I think it's probably a time-consuming process to get a player into a capture suit, have them bat, then take all that and implement into the game.
There's been two new batting styles added over the last two games. So that's probably going to be lots of new shots added to the game.