Thunderbird Email login and retrieval

Hi My desktop computer was stolen in 2019. Somehow I managed to get my emails and archived emails back on a new computer via a computer repair shop which build me a new better comp. Then 2 years ago my computer crashed and I can't get Mozilla Thunderbird back but need my archived emails etc. In the meantime I received my emails directly from Vox. How can I set up my old Thunderbird account again without loss of any archived emails. PS: I don't have the old password anymore either. Thanks in advance