I love houseplants, but I don't have a natural knack for promoting their optimal health. I am not sure what I am doing wrong with my peace lily so I will try to describe what I normally do for it, I imagine I am probably making multiple errors.

I have had it for a couple months and all of the large and small flowers have turned brown (so I trimmed them off at the base), I don't see any new flower growth, and the leave tips have also turned brown. I have not re-potted it since I bought it, but I have a bag of peat moss and a houseplant soil mix I planned on mixing together to use to re-pot it soon.

I initially had it under a North West facing window off of a covered deck area, but moved it to a brighter South East facing window, which seemed to stimulate more growth. I water it about once a week when the soil is very dry to the touch using tap water ( about 3/4 of a 17fl oz bottle) and have used a couple pumps of 1-1-1 indoor plant food per month. I have tried to keep water in the bottom of the outer pot to promote humidity, as suggested in an article I read somewhere. It stays somewhere between 70-80 degrees inside. But, it all seems to be to no avail, from what I can tell.

Ashley - If you are looking for perfection, I don't think you will find it with live plants. Your Peace Lily looks fine. Individual flowers last for only a week or so before dying. In the photos, I see only one small brown tip. Limited brown tips, especially on older leaves, is normal and they can be trimmed off with sharp scissors.

If you repot your Peace Lily it may retard its growth and will definitely discourage more flowering. Peace Lilies are not ever-bloomers. They go through periods of no flowers and then spurts of flower production.

Lots of bright, but indirect, sunlight is best and you seem to have the watering well under control.

Keep up the good work, but be patient as Mother Nature cannot always be rushed.

agreed with Will. It looks happy. Do not repot.
Or - if you can't help yourself, repot up one size but do not tear up the roots, and after repotting make sure you get the original rootball watered, that water doesn't run through the new soil and out.