Pondering alternative liquidity solutions for larger orders

Been trading $EURUSD and some crypto CFDs with my current broker for a few years now. Generally solid, but I'm starting to hit a ceiling on order size where slippage becomes a real factor, especially on less liquid crypto pairs during volatile periods. The execution is fine for standard lots, but anything that starts pushing into significant volume requires more finesse than their current pool seems to consistently offer without a noticeable spread widening or multiple fills.

Curious if anyone has explored or implemented solutions for better liquidity beyond just what a single retail broker provides. I'm talking about more direct access or even prop firm arrangements that offer deeper pools without the typical KYC/AML friction becoming a major roadblock for onboarding. The idea of piecing together execution across multiple accounts just to manage liquidity feels inefficient and error-prone.