What's a quick win for optimizing spend? What's been your focus or "lowest hanging fruit"?
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Direct chargeback to owner / project team using resources
Optimizing SaaS spend
One of the lowest hanging fruits is to quit from proprietary Java.
One of the long-term solutions is to setup Technical Standards in your company to manage vendor products and related annual license expense.
By conducting a software license review and an investigation on which tools you have licensed that share functionality. Yes there will be change management, but you can save a bundle. I'd also look at your contracts coming up for renewal and seeing where you can negotiate for a savings. New area I would look at is review your incoming tickets and see what you can automate or fix a process for to save time for your end users and help desk.
Actively manage cloud resource utilization. Identify lower environments or 'labs' that don't need to run 24/7. Remove unused resources from use and implement non-production off/on scheduling of resources for use. There is plenty of data, reporting, and tooling to help identify and manage those resources.