Best way to speed up my aging Android phone?

My Android phone is about 4 years old now, and lately it’s been feeling super slow and laggy, especially when I try to open apps or switch between them. I’ve already cleared the cache and deleted some apps I don’t use, but it’s still sluggish. I’m running Android 10, and I’m not sure if a factory reset would be worth the hassle or if I should just start thinking about a new phone. Has anyone found good tricks to speed up older Android devices without losing all their data? Maybe some apps that help manage background processes or something? Also curious if a custom ROM is worth exploring or if that’s just too much for an average user like me. Would love to hear what worked for you or if you just bit the bullet and upgraded. What’s your go-to approach for giving an old phone a new lease on life?