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Jumping in here - battery replacement is definitely the low-hanging fruit for a 4-year-old phone. It’s surprising how much smoother things feel when your device isn’t struggling to push power through an aging cell. If you’re handy with tools, plenty of repair kits online come with step-by-step guides and all the parts you need. As for custom ROMs, they can be a game-changer but come with a learning curve and some risk. If you’ve never flashed before, maybe try it on a secondary device or spend some time reading up on forums specific to your phone model. Sometimes, just a clean factory reset combined with uninstalling heavy apps and clearing cache can also help without diving into ROMs right away. Swapping out storage is less common unless your phone supports microSD cards, but if it does, moving apps or media there can free up internal space and reduce app crashes. Overall, start small with the battery and

For a 4-year-old Android, lightweight launchers like Niagara or Lawnchair can really help speed things up by cutting down on background processes and animations. Also, turning off or limiting background data for apps you don’t use often can free up resources. If you haven’t already, disabling animations in Developer Options (set Window animation scale, Transition animation scale, and Animator duration scale to 0.5x or off) can make the UI feel snappier. About custom ROMs and rooting - I've tried LineageOS on an older device, and while it did improve performance and gave me more control, it’s definitely not for everyone. It requires some patience and can be a hassle if you run into bugs or need specific features like camera quality. If you’re comfortable with tinkering, it can be worth it, but otherwise, optimizing with lighter apps and settings tweaks might be the easiest path.