Honda accord transmission f. Up?

Bought a honda accord 2003 v6 for 34000. Engine was perfect transmission was perfect it just needed steering flush but recently my. Transmission is acting up. Doesn't have acceleration. And gears don't engage. I already changed the fluid but didn't really fix it. I just don't want to spend like 3k for a new transmission. What in thinking is. Revive transmission with antislip (or at least try) and sell it right away for around 2800. Is this a good choice? Or how about trade in at a dealer?

Nothing works in Honda transmissions but Honda ATF. It's toast.

It sounds like the tranny is in "limp home" mode. Get the codes read out so you'll have an idea of what is wrong. It might be something cheap to fix like a sensor.