If you don’t want lose it again you can program a bot that login eveyday for you. (I don’t know if this is allowed in this site, i saw that in other site like this were allowed)
A bot, something like this ?
login = "https://www.hackthis.co.uk/?login"
payload = {"username": "DIDIx13", "password": "ILoveFlabby"}
s = requests.Session()
s.post(login, data=payload)