If you loved Mobile Suit SD Gundam's Counterattack, try Lupin the Third: The Last Job
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
You already loved

Mobile Suit SD Gundam's Counterattack
→
Try this next

Lupin the Third: The Last Job
What they share
Both films are directed by Tetsuro Amino, and they sit in Action / Animation / Comedy territory. If that's the register that drew you to Mobile Suit SD Gundam's Counterattack, the second film will land in a comparable space — through a different lens.
What Lupin the Third: The Last Job is
This TV movie would like to remind you Lupin III is still cool. Our favorite thief targets a priceless artifact en route to Germany, triggering Inspector Zenigata's apparent demise. Lupin must then outwit a ninja clan to secure the treasure. It's comfort food.