The solution to this issue is Nym. The Nym mixnet was designed from the ground up to counter an adversary that can monitor its network through net-flow logs.
The only problem is that its not free like Tor is, and there aren’t OSes that restrict the entire system’s connection to Nym, like Whonix and Tails. You could theoretically make a “Nym Gateway” yourself with intermediate Linux knowledge. Its also not a browser but just an anonymizing network, so you have to account for browser fingerprints yourself.
Its marketing as a “VPN” is misleading; its a mixnet, more akin to Tor than it is a VPN. Nodes are ran by volunteers rather than a company.
It’s also slow. But unfortunately you need slow in order to defeat this kind of issue.
Mullvad’s DAITA (Defense Against AI-guided Traffic Analysis) also is meant to mitigate this issue and mitigates it by introducing random noise, standardizes packet sizes, and such. I wouldn’t consider it as “potent” as Nym and its 5-hop paranoia is, but its not nearly as slow.