Is Cardano (ADA) a good coin to invest in it for long term?
Yes, it is a good coin to invest in for the long term. If the price is still at a lower price, you can buy many amounts, hold it, and not touch it before the price increases. At least, that is what I did before, and I sold it at the highest price the last year. With the price now being down a lot, I already bought some more and still hold them until now. The price is still good, so you can do DCA and start buying from the current price. While waiting for the price increase, you can also stake ADA on Binance.
I would say that it depends on what the team is planning on for the future and what the other project creators think about it as well. Remember BNB had the smart contract BEP20 way way later than Tron ever did, but Tron never went against ETH and won, they always lost and we are talking about a situation where it is looking like BSC is either winning or at least hurting ETH when it matters.
So in the end, ADA could be like BSC or it could be like TRX, we do not know which one it will be like. If they can build something amazing and attract many projects under their chain then it would be a high price coin for sure, if it fails to do that then it is going to be a bit of a tough deal for them to go up.