Could you share more about ALEO's roadmap and any upcoming milestones? Also, what are the key factors to watch for its performance post-launch?

A good explanation has been done by the OP itself..

Here is what i think are the key Factors to watch for Post-Launch Performance:

Since the basic idea of ALEO's mainnet launch is to attract developers than monitoring the size of the developer community will be important.
It wants to facilitate the creation of dApps - so how many are being developed will be a key factor as well.
The introduction of a token - how the market will accept and react to it.

Overall keeping an eye on these milestones and factors will help you assess ALEO’s potential as it develops post-launch.