the only Altcoin that I regret not to invest more while I have a chance and while it's too cheap is Oyster Pearl PRL.
Oyster after it was launched and listed on coinmarketcap.com last year on november, it was price valued as low as $0.0005 and I only invest 50k plus Oyster coins that time.
If I only knew that it will explode as high as almost $5 in next 6 weeks then I should invest more than that.
Today Oyster had a price range of around $1 but everyone is very excited for it's second pump starting next month that it will soon surge up again as the new altcoin Oyster Shell SHL airdrop for PRL holders only.