Advice: Keep or Not?

Need some advice. 2010 with ~240,000 miles. I’ve had it for about 5 years. Have done the following major work:

-engine replacement (Gasket Masters (w/ updated piston rings, etc.) about 2 years ago
-all struts, shocks, sway bar and tires about 3 years ago
-others: non-hybrid battery, cooling system flush, transmission fluid flush, hybrid cooling system flushed, clean all fuel & air passages, smaller stuff

I'm taking it in to have brakes checked next week and have a feeling I’m going to have to put some money in there. If it's a big bill (calipers...), I'm not sure if I should have it done. I have not yet replaced the hybrid battery, so I’m assuming that’s on the horizon with all the miles on this vehicle. I also have not yet had the brake booster failure, but I think it might be coming (I'm going to post a separate thread on that if I don't find what I need on the board). I get the buzz pretty frequently, even when the car is in park.

I can’t afford a new car and don’t really want to spend $15,000-20,000 for a half decent used one in this crazy market. It’s hard for me to get rid of this thing after replacing the engine and suspension in the last few years, but is it time to cut the cord with this vehicle? Is it worth planning to do the hybrid battery & booster in the near future? Anything else major likely to go wrong in the next few years besides those two things?

Thanks for any advice.

 

Yes. Here are my other notes of what they did:
Replaced engine with rebuilt. New sparks, coolant, egr cooler. Also included: pcv valve & hoses, intake manifold cleaned, replaced intake manifold gasket, Felpro head gasket, new rod & bearing, update piston rings (J&D), checked hybrid battery- fine.