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You came into this forum 2014, going by your account you have high amounts of post actives here and this very question gives you away as a Newbie, besides how are you expecting to get answer to the best time to by Dogecoin, I have an opinion which may be very wrong, and question to is something that has been said in this forum, the amount of money you choose to invest is your personal decision but it advised to let it be in line with your worth/Capital in other words invest what you can let go of, if things crashes.
Luda already tagged this account as a hacked/ sold account in 2018 and may be it is gone to several hands after that and hence the curious question about Dogecoin.
Elon Musk is the best person to answer anything about Dogecoin, i will not invest in Dogecoin thinking i would make a huge profit, all of my investment in Dogecoin in the past was to use them in gambling sites and luckily for me the shilling from Elon Musk gave me an unexpected profit.
investing in doge, is like you are investing in a pump and dump coin because you have no clue when will elon tweet something about it. it is an old meme coin but we don't know if there are real developments in place. up until now the supposedly collab between elon and doge team seems to be nonexistent.
anyway, if you want an assurance with your investments, better include btc in your portfolio. because no matter what, btc won't disappear. but with most new alts, once the dev collected their share, they can disappear whenever they want.