Well there’s a couple of things. For gifs that are about 500px wide and 280px in height try to keep under 15 frames, which can be a hassle but it decreases the file size, obviously. If it’s still too big try and darken the colours using ‘curves’ or ‘selective colour’ and darkening the neutrals and blacks etc. For saving on web & devices sometimes turn up the lossy, which reduces the size a little bit but don’t use it too much ‘cause then the gif will start to get grainy.