This are the basic items I have done on my cars for the last 20 years. I have never brought one of my cars for Service for any of these easy to do yourself items.

Oil changes every 3-5K miles or every 6 months

Air Filter - every 2 years

Coolant Flush - every 2-3 years

Spark Plugs - every 30K miles or so

Rotate Tires - every 8-10K miles

Other than that, I check the belts & hoses every so often for any wear or breakdown & keep an eye on the brake pads so they don't score the rotors.

Timing Belt - I would follow manufacturer's recommendation within reason & just check around for who has the best price
to replace.

Tom