games crashing

hi all, lately ive been playing arc raiders and fortnite and my games keep crashing. ive been checking the performance in my task manager while playing and my ram is running high upwards of 90% sometimes and a couple friends said a small spike in ram usage can make it crash. is there anything i can do to clean up my pc so i dont get those spikes and make games run smoothly? ive had this pc for almost 3 years with no issues and this is only happening as of recently, any help is greatly appreciated