just want to say how well my 4 Runner has treated me

'07
Sport Edition 4X4
4.0L
but after 98,000 miles I have only replaced tires and brakes, change the oil each 5,000mi and had the tranny flushed
Am I giving back enough to this faithful ride ?

it runs like a champ and I average 20+mpg
I'am considering
serpentine belt replacement, the original looks fine no cracks or splits;
I was told to get a GoodYear 'gator back' but the local shops only have 'Gates' or 'Dayco'
any thoughts on a certian brand ?
spark plugs - NGK or Denso per the manual
and does this engine require a timing belt change ?
what else should I do to keep her running another 5 years?
any and all opinions are welcome
thanks in advance from Beautiful North Georgia