I don't think it's wise idea to invest in a coin only by looking the previous ATH, because there's no guarantee the coin will comeback or beat the previous ATH, it's not like Bitcoin.
Doge price was increase because Elon Musk trolled in Twitter and people take it as serious, so many people want to buy Doge. If Elon Musk stop to troll about Doge, Doge price will not increase a lot, just like in 2017/2018.
Exactly the same thing i was telling my junior brother, I don't like investing in a coin been hype by one man or group of people, such coins will enjoy the riding when the backing is ongoing but anything the person withdraw the support, you will see a massive drop, I prefer to invest in a coin that is community driven that has a lot of support from different places, So for me Doge is a no no unless i will get it in deep and wait for bounce back to sell off.