There are still good alts in the market. The majority of them are wortheless, yeah. However, main alts like ETH and SOL are here to stay
You know it's important to filter out the altcoin you don't need to the better ones moreover newly listed coin in the space some of them can't be trusted neither are they reliable to hold for long instead I will always encourage people to have bitcoin in your portfolios. Apart from Ethereum and BNB, Polygon and few other coin I didn't think people should hold irrelevant coins in their bags since they aren't worth holdings and they are also being driven by Bitcoin price and whenever the price goes down it affects all every coin that depends on bitcoin for growth.
Yea, this is expected of course it is not advisable to keep what you don't need, delist some that are not yielding anything to give way for the good ones, my problem is how to identify a good project, athough there are still new good projects but many scam projects had made it almost impossible for us to identify the good ones.
Bitcoin is the most trusted coin as such it is required of everyone in the crypto space to have a bulky portfolio in Bitcoin before diversifying to altcoins, there is no doubt that the altcoins you mentioned remains the best in terms of diversification but one can not totally rely on them for some reasons which is value and trust in some case, Bitcoin remains the best in terms of value and many not manetioned qualities but I also support diversification, although I was not in support of this earlier but now i feel that once investors invest on the altcoins that follows the direction of Bitcoin there may not be a problem for the investors that have those altcoins in their portfolio.
The only way to know good project is to just go for the trusted coin in the market and or maybe you go for top 10 to 20 altcoin in the market, with this you can hold them for long without having the fear the your portfolios would crash or sink down. Most importantly your bitcoin holding should exceed any other holding in your portfolio because if you have altcoin more than bitcoin it easily affects your investment when the market seems to be a bit bad or when there seems to be bad news in the market.