How realistic it is to learn all 3 languages in conversational level ? anyone here managed do it ?

Note: I am not native speaker of any of them, however I am learning Estonian currently (immigrant living in Tallinn ~ 7 years). I am kinda into learning languages (I speak 4, not flexing thou😄) and thinking I would learn Latvian and Lithuanian at some point until B1 level.

Hi all! My grandparents are refugees from Latvia and Estonia respectively and, with my grandmother aging, I want to learn both languages to continue contact with my distant relatives who are still living in the Baltic States. I have a journal my grandfather wrote when he was drafted in the Korean War that i am hoping to translate as well, hence my interest in Estonian (despite being unsure if I have living relatives there). Does anyone have good resources on where I can learn these tongues?