Reddit mentions of First, Learn to Practice

Maybe reading stuff helps, Look in your library for books like Werner Effortless Mastery, or the "Inspiration" tag at jazzadvice https://www.jazzadvice.com/category/inspiration-for-jazz-musicians/

There's other books,

https://www.amazon.com/Passionate-Practice-Musicians-Memorizing-Performing/dp/1587900211

https://www.amazon.com/First-Learn-Practice-Tom-Heany/dp/1457507757/

It's certainly possible to practice inefficiently and ineffectively.

There is some published material - books - on how to spend your practice (and lesson, if you have a teacher) time to get the most out of it.

Here are a few links, you may find some at a public library"

https://www.goodreads.com/book/show/135378.The_Art_of_Practicing

https://www.amazon.com/Music-Practice-Practicing-Instrument-Professional/dp/151221583X

https://www.amazon.com/First-Learn-Practice-Tom-Heany/dp/1457507757/ref=pd_sbs_14_img_0/134-8911672-4313913?_encoding=UTF8&pd_rd_i=1457507757&pd_rd_r=5d4c6c6a-c602-4668-8aa1-fef7146277f2&pd_rd_w=6dxpV&pd_rd_wg=AAalo&pf_rd_p=5cfcfe89-300f-47d2-b1ad-a4e27203a02a&pf_rd_r=ZG5EG45FHK5CSS47MQ5F&psc=1&refRID=ZG5EG45FHK5CSS47MQ5F

EDIT: it's my observation that the process of learning is something that has to be learned, and that can be best done with a teacher. Teachers often book lessons in blocks of time - say a month, to make it worth their while and make a stable schedule - so if you discussed with a teacher the goal of improved learning habits, as distinct from instrument technique, that might help you too; some things are faster learned if taught by another.