after testnet will the prices increase ?
With the current market? I would say no but with this kind of news it will cause pumps and pump groups will take advantage to gain profit however for sure it is only for a short term but still people who do that will regret it in the future.
i don't really think that would be the case at the moment, like you said, the current market situation is affecting lots of projects, there are some project which has already also achieve 10k transactions per second during their testnet but did nothing to the price besides this is just testnet and it doesn't make much difference until mainnet is lunch then we can see if it can actually acieve same results.