First thing to do is your homework.
You can go to KBB.com and do their ICO (instant cash offer) however your car is so new, it may not let you do ICO. If not, you can get an idea buy using the generic my cars value. Your initial trade offer from a dealer is going to be in the lower range of that.
This is a pretty decent payment calculator,
https://www.carloancalculator.me/
If you know the auto tax rate, and get an accurate 10 day payoff on your loan.
If your credit is decent, a bank may loan up to 130% of loan value of the new car. Here's the thing, if you do it, plan on keeping that V8 for a long time, because you won't have much choice because you will be way underwater on this car for a very long time.
If you decide to wait, which is the best financial decision, do NOT modify your V6, especially with forced induction. At that point, many dealers would not even want it from trade in, and if they do, they're only going to offer you wholesale for it. They can't certify it, and almost no one wants a Camaro like that from a dealer's pre-owned lot.
The other thought is to go back to the dealer you bought the car from. Pick out a '19 SS if they have one. They are more motivated to move those and tell them what you want to do. If they are a decent dealership, they might work with you to get the deal the done. Just expect that you might have to throw some cash on the deal and that your payment might be around $200/mo more than what you're paying now.