Commission structures: What if you're at a small company and wear more than just the sales hat?

In a bit of a unique situation – I do sales but also (due to startup / company size) also wear some account management and customer success hats.

Does anyone have or know of good atypical / unusual commission structures, where base is a bit higher than normal but there's still incentive to sell larger enterprise contracts?

For context, current structure (not counting company bonuses) are flat commissions per deal – not based on % of signing amount – after hitting a certain threshold.