Recently, I purchased a pre-owned quadcopter equipped with a Caddx Vista. Unfortunately, I'm unable to receive video signals on my current goggles: Eachine EV200D and SkyZone SKY04O. Could you provide recommendations on which goggles or modules I should consider buying to ensure successful reception of the Caddx Vista video signal?

The Caddx Vista uses a proprietary DJI digital video link. There is no way to receive a video signal from a Vista on analog goggles. DJI don't make any modules that can connect to other (non-DJI)  goggles. If you want to make use of a Vista then you will have to buy a pair of DJI goggles (DJI FPV Goggles V1, DJI FPV Goggles V2, DJI Goggles 2, or DJI Goggles Integra).