The best way to shorten your statements is to consolidate and combine bland words into more powerful ones, that pack more punch. Here is one example.
Worked to prepare and combine discipline and assorted lesson plans to increase concentration, participation, and student accountability
First of all, the first word is worked. We know you worked. That part is obvious. This is a resume. And the second verb, prepare, is a bit wasteful... are there more impressive words we can use that imply "prepared" by default?
Pioneered new curriculum with combined lesson and discipline plans (2013 onward)
With the space you earned back by consolidating, you can include more detail, like when the new program started.
Using “onward” after the year the new program started also conveys that it was a success. You get that bonus picture in the readers mind, and it cost you fewer words to boot.
We went from 17 down to 11 words and gained points for impressiveness, clarity, and a nice quantitative measure of time.
Another example to try out:
Managed opening duties including cash reconciliation, receiving produce shipments, and various store opening responsibilities
Duties and responsibilities are redundant action words. Can you be more brief and still be specific? Absolutely! Just ditch one of the redundant verbs. Take your saved space and add more detail about what those duties actually were.
Store opener: cash accounting, shipments, shift planning, and first-batch baking.
Replace “various other responsibilities” with the actual responsibilities themselves.
More detail, just as concise.
As you get the hang of consolidating bland words into more powerful replacements, you'll be ready to try out my favorite rule for writing bullet points.