Why the worry since you are holding just 10% ETH in your portfolio? Moreover vitalik and team are really working hard to keep ETH at its glory position or even surpass past success, i think you should think twice, ETH still has better chance of growing higher someday
Even 10% could make a difference on your portfolio. Who knows, that 10% might worth a huge amount of money, so yeah.
Looking for the past prices of eth, we couldn't reallt say neither it's a shinking ship or sleeping giant. We're not really undervalued which is the price never really reachead a very botton mark. We've had tons of increase and decrease these past few months even year. The experienced ones take that as a chance to make an entry and exit point.
I don't even know whether ETH 2.0 will get postponed or not, still, a great development takes more time to be completed. As to make sure nothing goes wrong and everything is in place.