I would be transplanting within the next few days. Those trays are nice for starting a ton of seeds, but I found better success starting them in individual containers like solo cups.
Then you should be trying to follow a VPD chart for your temp and humidity. Read up on VPD to understand the table.
Then you should check out DLI
https://ilgmforum.com/t/start-using-dli/64987/13