I think you should go ahead to invest in the altcoin as you have planned doing, the fall in price now is just for a while and it won't last forever. The good thing is for you to invest when the price is down so that by the time price increase one can sell and gain a whole lot.
yes, I agree with you the market will not forever experience a decline I'm sure the price will soon recover, I think it's a good opportunity to invest in the long term in order to get big profits in the future.