There are a few ways you can handle declension and conjugation.
One is to use the Pillar Technique with nominative, genitive, dative lined up on one side, accusative, ablative, vocative on the other.
You can usually get in at least first and second person on each Pillar.
I feel there’s a problem in thinking that all declensions (or conjugations) are “one” word, however.
You’re not wrong, but that’s not always helpful when applying memory techniques.
Rather, if a particular rendering requires it, pop it off in an alphabetical Memory Palace (as I teach) and then add a phrase. Then run substitutions based on your current level of knowledge, such as:
I carried… I will carry… They carry, they will have carried etc.
Make sure that you are regularly reading, writing, speaking and listening. Yes, even in Latin. And there are opportunities to do so.
Also, in reading, it’s helpful to do a lot of anticipatory reading, which is essentially trying to work out what’s being said and perhaps performing some etymology as you go.
In my Bruno Reborn project I talk about more about this in the treasury of Bruno’s Latin section.
In any case, a lot of this overwhelm can be reduced and I would suggest the above combined with reading, writing, speaking and listening so that you’re getting a combination of Recall Rehearsal and “natural” spaced repetition.
What Latin language books do you currently work with, both in terms of textbooks and primary texts? I might have some other ideas for you.