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What kind of phone do you have? You might be able to boot into recovery to wipe the cache, although that might not fix your issue if there's a problem with your system files.
Here are the instructions for getting into the recovery menu.
https://www.hardreset.info/devices/mobicel/mobicel-trip/hardreset/first-method/
BE CAREFUL!
These instructions are for performing a factory reset. You don't want that as your first attempt. It would wipe all your user data. You want to make sure you choose the option below that "wipe cache partition". You may eventually have to try a factory reset if wiping the cache doesn't work. I do hope you have important data backed up off the phone.
Was your phone rooted? As far as the documentation goes, stock recovery should have a "wipe cache partition" option. When you boot into recovery, does it list a version number?
i have my sd card as storage. should i remove it first?
I can't really find too much information based on that. It might be best to contact your carrier or where you purchased the phone. Other than that, a factory reset might be your only option.
If you mean as adoptable storage, then removing it would make no difference since it's encrypted. you won't be able to get at the files.