We're not yet at the last quarter, it should be by October but the point of what you're saying is true. There will be those that will start to increase during these periods and it's unknown when it will happen.
Project like Solana, DOT, BNB, BTC, ETH can still give you good profit and you investing now does not mean you would be profiting less.
They are better option than most of the overhyped project that will come up this quarter just to deceive you to investing with them. Like I said, choose wisely because this is likely the last chance to get into quality project before they achieve new all time high for the year.
This, that's why it is an unending recommendation about buying bitcoin because it's always the best choice. With those pumps from altcoins that are prone to pump and dump, newbies are overhyped with it not recognizing what bitcoin can bring to them stably.