The minimums for our portfolios are subject to change and are largely determined by the network congestion and average fee. Currently, the minimum to invest is $100 (on L2 side of Ember).
If you still are seeing $500 - $1000 minimums, you need to swap over to the Hybrid Custody (L2) side of the app by heading to your Settings, then Blockchain. If you do not see the Blockchain option, please check out this article: https://help.emberfund.io/hc/en-us/articles/8949479361435-How-can-I-switch-to-Full-Self-Custody-L2