Yes of course invest in bitcoin or ethereum. Because these are the most advanced coins in the world of crypto-currencies. I believe that now is the most suitable time for investment. They will soon grow up and you can make good money.
Yes you can invest in bitcoin and ethereum now while it is still in their downtime situation, but do not expect high return of profit and maybe up to not getting a profit. Because crypto is facing a hardships now and we do not know when it can really recover.
I agree on that investing in ethereum and bitcoin todat is really advisable by some ecpert on crypto feild. Because anytime bitcoin or maybe ethereum will rise without a prior notice. We need to invest on it because we still now in a very low price which means that it is a good price to invest because it is an advantage , because maybe in the next few days from now we cannot afford to buy those coin and we maybe start blaming for taken them for granted when they are on dip.