Grin is one of the coins that I am very optimistic about increasing in price and becoming more popular in this space in the future.
However, keep in mind that whatever we all talk about in terms like GEM, it sounds like venture capital. If you haven't done your due diligence, don't get your hopes up on this. Basically, some of the coins that I follow still give me a positive feeling about them going forward, but if it doesn't, that's okay too.
Grin tokens are not real gems, they don't come back when the market is bullish. There is only a significant decline, old investors may have a lot to lose with it.
It is very difficult to find and invest in such coins. Even if you can trade, I don't think you can wait until you hit 10x. Because most people prefer to sell after doing a few x.
On the other hand you are right, it is very difficult to find gems when the market is bearish. Of course a trader very rarely finds x10, we can find at least 2x or 3x that too when lucky. X10 and beyond can only be found when holding long term.