Subtract the vitriol and anti-America sentiment, and yes this is true. If country A, which is not sanctioned by the US does business with country B, which is subject to US sanctions, then country A risks being sanctioned by the US as well.
Reminder: sanctions wouldn't work if there was no incentive to do business with the US.
As a country, the best you can do is denounce Maduro and side with Guaidó. The sooner Maduro is out, the better for everyone.
The sanctions are against Maduro and his small group of accomplices, not against Venezuela. If you want to deal legitimate business, contact Juan Guaidó President Interim and/or Venezuela's National Assembly, which is the last remaining legitimate elected institution. More than 60+ (and growing) countries have officially acknowledged Guaidó as the legitimate President, and only less than 20 keep backing Maduro.
Officially acknowledge Guaidó as legitimate President Interim of Venezuela:
🇺🇸 🇨🇦 🇨🇴 🇧🇷 🇦🇷 🇵🇾 🇵🇪 🇨🇱 🇬🇹 🇭🇳 🇵🇦 🇨🇷 🇪🇨 🇬🇪 🇽🇰 🇦🇱 🇬🇧 🇧🇸 🇩🇴 🇭🇹 🇮🇱 🇦🇺 🇵🇷 🇩🇪 🇫🇷 🇪🇸 🇱🇹 🇦🇹 🇵🇱 🇩🇰 🇵🇹 🇱🇻 🇸🇪 🇳🇱 🇧🇪 🇭🇺 🇨🇿 🇪🇪 🇱🇺 🇫🇮 🇭🇷 🇲🇰 🇮🇸 🇧🇬 🇲🇹 🇮🇪 🇦🇩 🇺🇦 🇨🇭 🇯🇵 🇹🇼 🇲🇦
Keep (officially) backing Maduro:
🇨🇺 🇧🇴 🇷🇺 🇹🇷 🇨🇳 🇸🇾 🇵🇸 🇮🇷 🇧🇾 🇳🇮 🇸🇻 🇿🇦 🇬🇶 🇲🇿 🇧🇯 🇱🇦 🇿🇲 🇰🇵