How do I get my Ethereum back?

Could you kindly enlighten me on the process of retrieving my Ethereum? I seem to have misplaced access to it and am at a loss as to how to regain possession. Would it involve any specific steps or procedures? I'm rather unfamiliar with the intricacies of cryptocurrency, so a detailed explanation would be greatly appreciated. Is there a chance of successfully retrieving it, or could it be lost forever? Any advice or guidance you could offer would be invaluable in helping me resolve this issue. Thank you in advance for your assistance.