Are FET and POL Worth holding? Are altcoins worth it at all anymore?

I'm holding a few hundred USD of each of these and they've been pretty poor performing, as much as anything the last couple months, but I also know very little about these projects. Polygon seems like it's mostly powering shitcoins, like a discount SOL, and I don't have a clue what FetchAI is even about.
Are they worth holding onto, or should I just sell and buy more BTC?

I'm also holding a significant bag of Solana, which I'm also questioning. Hell I'm even doubtful about ETH. All these alts seem like they're just shitcoins powering shittier shitcoins.

XRP is the only alt I have that seems like it might be useful, but the SEC is making that hard to hold.

I think I might be becoming a BTC Maxi!

As an aside:
Have I reached 500 characters yet? That seems like such an arbitrary rule. Why doesn't the editor tell you how many characters you have, like the title field does?