Fuji Excursion Train- got reserve tickets with klook: Car 4 still stay on train?

Hello, I just booked tickets with Klook from Shinjuku to Kawaguchiko station and couldn’t really hand pick seats. I was watching YouTube videos and it seems like most of the people got Car 1-3 which is the actual FUJI Excursion train. Should I be worried about being in Car 4 and do I have to get off the train or move to Car 1-3 at Otsuki? Thank you in advance!!

UPDATE: changed my tickets from the 11:34am departure time (Fuji Excursion #93) to the earlier time 10:30am (Fuji Excursion #15) and now I am in Car 1. I think #93 has a longer travel time for that reason? Thanks to all for your comments!

by CuriousFisherman6036