You’ve already maxed out every harnessed option by height and weight, your only option for forward facing would be a high back booster and seatbelt. The britax kidfix pro with the crotch guard gives the best support for younger kids but it is still pretty young to be using a booster safely x
@Paige she hasn’t, the axkid she has is 25kg and 125cm rear facing
Ideally you want to wait until your child is ready for a high back booster as it’s not advised to harness forward facing so ideally wait until closer to 5 years old if you can. X