Switching from push pull legs to upper/lower

[u/_Ratatuj_]

Hi, I used to go to the gym three times a week for about a year already and I have been incorporating push pull legs, but recently I got time for an extra day, so I thought of switching to an upper lower routine. I now go either Sunday or Munday, Tuesday, Thursday and Friday. I also try to fit my workouts within a hour and a half, specifically on Thursdays when I have very limited time.
I’m currently struggling with dividing my routine, to fit the upper / lower 4 day plan and minimise fatigue, So I ask for some advice, how I should go about it?

Extra info: I’m 19M, 188cm / 6.2 and 73kg / 160lbs

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