Stop using Telstra then. There’s an abundance of NBN resellers who sell better packages for cheaper than Telstra. At this point Telstra is just for old people who don’t want to change the services they’ve always been with.
If you compare 100/40 plans to starlink, starlink is about 10aud more over the best reseller promotion I can see, but has the occasional promotion; and getting cheaper.
If you are churning plans anyway, and that's the speed you want, you should have starlink in the mix.
I fully expect the NBN wholesale to keep getting more expensive, while I expect satellite providers to get cheaper.