"This will likely drive them towards more cost-effective, monolithic blockchains like Solana and Avalanche"
I'll give you a tl;dr: The TVL growth is abysmal and nothing to write home about, From its low of about $500M, it has only grown to $850M. Sure, it's a sizable increase but when we compare the overall inflows into the crypto market and the price performance of AVAX, there seems to be a great mismatch.
The number of core developers and code commits is largely flat as well.
The most interesting thing I found was the Beam Subnet. Its growth in terms of active addresses and daily transactions in the last two months has been remarkable, to say the least. And the parabolic price action of BEAM certainly doesn't hurt.
The other subnets are pretty much flat in terms of their growth metrics (at least at first glance). If you are more interested in this, I think you should definitely check this out and compare various growth metrics between these subnets: https://subnets.avax.network/stats/network