I think, Ethereum and Solana are potential altcoins you will invest in the bearish season and you will not be afraid of holding the altcoins for long term, because they are in a good position in the market among the altcoins and when the price of Bitcoin is increasing, those altcoins price will be increasing too. Well, you can still make your own research about those altcoins i suggested to you to invest, because I know they are good altcoins that will make beginners to make a passive income when there is a bullish season. If you have it in mind to apply for short term holding, I will advice you to apply long term holding on those altcoins, because the more you hold them long in your wallet, the more they add value.
Yes, the coin is worth investing in because the cryptocurrency market is dynamic and depends on several factors such as technological developments. Ethereum and Solana have enormous potential for now which has the potential for further growth in order to maximize the profits obtained with better opportunities for bullruns in the future with the performance position that has been achieved which is expected to increase the valuation of crypto coins in the future.
If you are into investing for a long term, utility tokens are the best bet. You can combine a number of older/successful and newer/potential coins. I have sometimes suggested against Ethereum but as it's ETFs are on verge of being traded, it is bound to have a higher price and retain it, so it would be a safe yet profitable investment. Solana is easily the best thing you can buy below $200. Unless something drastic like shutdown of Solana network for hours or a large vulnerability, nothing stops Solana from getting to $2000 in some time. It's an easy and safe x10. Likewise you can go for newer utility tokens that are promising, just don't go with old ones like Cardano or NEM or likewise.