The Kavastu ferry is not operating in 2025. According to currently available information, it will resume service in the summer of 2026 after maintenance work.
Alternative trip via Hansabuss. Here is the webpage for the bus company and a good route map with the schedule Web | Explore. Into the schedule search bar, type in the stops I will be giving you.
I would recommend to firstly go to 'Kastre' bus stop (choose 2nd stop from the list) and bus nr. 853 and nr. 804 will go to 'Keldri' stop in Luunja, where you will need to get off.
From the same stop you got off (Keldri), bus nr. 819 (also second option from the search bar) will go to Kavastu stop.
From there you should be able to continue your trip as normal.
Tickets I would advise to purchase from the driver, approximately 2€ per drive, but it can vary. Just in case have also cash with you when they do not accept cards.
P.S the driver may ask you where you will be getting off (1st bus Keldri, 2nd bus Kavastu)
Please make sure to check yourself that the bus will go in the direction you want. When clicking on the bus nr. you will see all the stops the bus will take as well as the timetable.