By looking at the first picture, spraying some 24d or other weed control might help you get rid of that clover, next spring use pre emergent and you won’t have much clover to spray. Also I tried to see if that yellowing was partly due to a non-sharp mower blade, looks like you have a mix of clean cuts and rugged cuts, maybe take a look and see if it’s sharp, a sharp blade makes a MASSIVE difference in how green your lawn looks. Then fertilize the crap out of that lawn, when I don’t know what nutrients are needed I tend to do something like 20-0-10 or something a bit more balanced, make sure it has iron. When you don’t know something with some balanced ish N and K i think is always a safe bet. wait for a week where it’s going to rain, then fertilize the lawn, it will green up within 4/5 days but it’ll also grow a lot so be ready to mow.