I'm looking at visiting NYC early-mid next year. I have Velocity Platinum and just over 400,000 points. What's the best way to get a business seat? I was looking at purchasing Freedom fares (around $2800 return) and then using 90,000 points to upgrade (return) from Economy to Business. I've read some posts about booking reward seats instead but obviously there is very little availability and the ones I have seen are close to 1,000,000 points.
I also gave some thought to using a service like iflyflat but given I have to spend points and also pay a non-refundable fee of $850 (whereas a Freedom or Business flight with VA would be refundable), it wasn't a very attractive option.
Any advice?
edit: should probably mention, I'm happy to just pay for a normal US domestic flight LAX-JFK but it's the MEL-LAX I'm trying to make affordable
I also gave some thought to using a service like iflyflat but given I have to spend points and also pay a non-refundable fee of $850 (whereas a Freedom or Business flight with VA would be refundable), it wasn't a very attractive option.
Any advice?

edit: should probably mention, I'm happy to just pay for a normal US domestic flight LAX-JFK but it's the MEL-LAX I'm trying to make affordable