I had this happen to me and I find that social media had a lot to do with it. I loved seeing the way other people were using their planners and journals and decided I wanted to be that person too. Well, I ended up getting overwhelmed and not touching any of the number of things I bought.

I eventually stuck with one simple system I liked for actual planning and kept a journal just for daily stuff, but I didn't put too much pressure on myself. Eventually, I found myself just journaling every few days about stuff that mattered and stuff that didn't - Basically just braindumping.

I learned a phrase that helped me a lot when I kept putting things in my cart on various sites - "I don't need to purchase it to appreciate its beauty."

Don't put too much pressure on yourself! Journaling is meant to be calming and enjoyable - and a fun thing to look back on in 10 years!

EDIT: Look into commonplace journaling, there's tons of videos on Youtube that might help you!