I know journaling might be one, and doing new things from time to time, curious if people have other tips
just do more non-routine stuff
This 100%. My partner and I bought a house in October, and we’ve been doing a complete remodel on it since, spending anywhere from 30 - 40 hours a week working on the house while also working full time. This has easily been the fastest 6 months of my life and I feel like I’m going to blink and be 80 years old on my death bed.
Routines are the enemy of slowing time!
Plank position slows things down a lot.
Watch this vsauce video:
https://www.youtube.com/watch?v=zHL9GP_B30E
tldr: retrospective perception of time depends on how many different things you remember happening. If you remember many things, it seems long. So do many things that you will remember.
Practice mindfulness and enjoy the present.
Time always seems to go by slower when you’re bored and/or miserable. Do with that what you will.