You have to manually link all the "back" and "next" since it's not an automatic process. The same applies to all the other links as well. But let's talk about the "back" and "next" links specifically. Let's say for example that you are in the * April note. Then you manually have to highlight "back" and add a link to * March. And you have to highlight "next" and add a link to * May. The same logic applies everywhere. If you're on the Q3 note, then add links back Q2 and next to Q4. If you're on the ... 5 February note or whatever, then you have to link "back" to 4 February and "next" to 6 February.
It's a LOT of work manually adding all the links within the Journal, for sure. But no need to do it all at once. Start by linking the Quarterly notes, and then just work on one month at the time. Or one week, as the week approaches.