I know what a stablecoin is, its utility, why the USA is pushing legislation to regulate it, but HOW do I INVEST in stablecoin?

Like the title says. What do do I invest in? Coinbase? Circle? Tether? How do I think about this? I want to grow my fiat dollars with this investment, and that's all for now. I'll own and use stablecoin later. For now, I want growth.

Matter of fact, is a stablecoin even investable? It's pegged to dollar and back by USTs. I think my better question is: do I invest in the businesses that are minting the coins? Damn it; this is confusing.