Ya I would first start by injecting as frequently as possible. I recently tried injecting ED for a couple months, and got labs back 2 weeks ago, and for how high my total and free T were, my E2 has never been as low as it was on these labs. Again, in comparison to how high my T was. The only other variables I changed were that I was injecting enanthate, vs my usual cypionate, and it was westward big pharma brand compared to my usual compounded cyp from Empower.
The other main ways to reduce E2, without using an ai, is to use a DHT based compound, such as oxandrolone or stanazolol, or even switching to scrotal testosterone cream will jack up DHT, and the elevated DHT will act as a mild E2 inhibitor.