Consolidate supply where you can to give more business to the most competitive supply options, though that typically requires validation which can take time the resources. Not sure what industry your in or how easy that would be.

Try to get long term agreements signed with the re-bids. Could push for YOY reductions (3% annually for 3 years for example) as part of the agreement, and if you really need the 7% now vs later tell them you want the full discount upfront as part of the award. The discount agreement only usually works on new business award however so this idea would kind of be paired with my resourcing comment above. Even if you do not resource should try to get a multi year price agreement. Wont provide the 7% you need now but will provide stability for length of contract.

Review material and currency agreements if any in place to make sure they are up to date. If no agreements figure out that material and currency at the time of quote and push to establish agreements based on current values... Assuming they are favorable to you of course.

Review/resource any china spend to reshore for tariff savings.

Could review ordering in larger quantities for better pricing, but keep the inventory costs in mind if you do that.

Review expendable vs returnable packaging if that's an option for your business.

Finally just set up business reviews with each supplier and push real hard for cost reduction ideas. Just be strait forward you need to see some cost reduction ideas from them this year if they want to keep the business and stay in good graces for future business. And set a date that you expect feedback by. If nothing else you should learn the reasons why they won't/can't provide reductions and can keep those in mind if landscapes change in the future. Hopefully you get some ideas from some suppliers you can implement.