Um, plug it in?
If the phone (or any lithium-ion device) was put away healthy, turned off, and with a reasonable charge (manufacturers use 30–40% for storage), the battery should be fine for months.
If the battery was allowed to run all the way down, and the phone was stored that way, then it depends on whether enough charge remains to energize the phone’s battery-protection circuitry.
So: Plug it in and see.
If it charges normally, no worries. Leave the phone fully off while the charge completes. When it’s fully charged, unplug and use the phone normally.
If the phone won’t charge, try Google’s “Fix an Android device that won’t charge or turn on.” (The concepts discussed there also work for Apple devices.)
If it simply won’t charge at all, then the battery protection circuitry is dead. You’ll need a new battery and/or professional servicing of the phone.
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