There’s this thread on how to access publications without institutional access: https://forum.inaturalist.org/t/access-to-research-publications-without-institutional-credentials/4877/2
A couple other sources off the top of my head are:
ResearchGate
Sci-hub (not posting link, since it’s not technically legal, but just Google it)
or checking author’s personal websites or even contacting them on social media or via work emails.