I just want to know what things I should do since the car is turning 100000 soon. Thank you.

Lights flickering like there might be a fuel issue or fouled plug.

I don't understand what this means. Fuel problems and worn spark plugs cause running problems. Are you having any problems? By this time the spark plugs should be replaced.

You didn't list which engine you have so I don't know if you have individual ignition coils. If you have spark plug wires, those should also be replaced. If your engine is an interference engine, the timing belt should be replaced before it breaks. A broken timing belt will result in bent valves and a much more expensive repair. All of these things are listed in the owner's manual.

Replace the air filter and cabin filter. Check the tire wear patterns. Have the steering and suspension systems inspected at a tire and alignment shop. These cars don't have a lot of problems with parts that separate leading to loss of control and crashes like on some other brands, but those parts should still be checked every year or two.

If nothing has been done yet to the brakes, an inspection is in order too. Don't let anyone tell you there's a specific number of miles left in the brake linings. The only accurate measure is percent of material remaining. 20 percent of remaining linings can mean two months of driving for some people and four years for people like me. It all depends on how aggressively you drive and how much city driving you do.