My main altcoin buy and hodl list includes; Ethereum, BNB, Solana, Cake, Swipe and Polkadot.
Main reasons are Ethereum is still the best altcoin and alternative chain.
BNB is the best competitor to Ethereum.
Cake is literally Uniswap of Binance Smart Chain, it will go very big in future.
Solana seems interesting with its own chain and projects like Serum.
Swipe seems to be good card project partnered with Binance for bright future.
You've forgot to mention Cardano. This project is backed by a team of reputable academics, researchers, and developers in order to bring secure and reliable smart contracts to the world. The innovative "Ourboros" PoS consensus algorithm for Cardano is heavily-tested to ensure the Blockchain remains scalable enough without compromising decentralization. It's expected that Cardano will challenge Ethereum in the long run, due to its consistent development and innovation unlike any other smart contract platform in the world today. Imagine "ADA" becoming next to "ETH" in terms of market cap sometime in the future. Taking into account the Cardano blockchain's current capabilities, I'd say that the current price per "ADA" is quite a bargain these days.
Always remember, any altcoin is worth buying if it's actively developed and maintained by the community. An important factor for any project's success is mainstream adoption. If the coin you're looking into is widely adopted in the mainstream world, then it's worth the long term investment. Otherwise, you're better off investing into Bitcoin itself. As long as you make your decisions based on facts instead of someone else's opinion, you've got nothing to worry about. Just my opinion