Is there a thin silver metal ring around the glass lens? If so, look for a break in it, and use a fingernail or small non-scratchy flat-blade object to pull it inwards and then down, after which the glass lens will fall out allowing access to the bulb. If it's an MR16 bulb, the bulb and reflector will be part of the same unit, so pull on the reflector not the glass bulb.

You can probably just buy new LED lights for your existing track. I has the large cans and found three small modern looking heads with colored glass lenses at ReStore for $1 each and just bought LED bulbs at IKEA to replace the halogen lights. You will need to remove one of the existing heads to check the type of track, some has 2 conductors and some have 3, some are line voltage and others are low voltage. The lights usually push against the rail and twist out or might have a pull down spring loaded connection. They might be a little stiff but shouldn't be too tough to remove so keep trying until it pulls out without needing too much force. I have known people to just pull and end up breaking the little tabs on the connection to the track

An article from someone who did it. http://freshcrush.com/track-lights-to-pot-lights/ "Well, I say easy, but that’s because I wasn’t the one shoved up in the attic cutting 4 new light boxes into the ceiling, installing the recessed lighting, with the vapour barrier, and insulated boxes. Yeah, that was a job for the man of the house. (Did I mention he despises being in the attic?) Love you honey!" A youtube about how to do it. Sometimes things aren't hard, they are just labor intensive. Wait until the weather cools if you send DH into the attic. https://www.youtube.com/watch?v=KEGfZiHlV4M If you pay an electrician to do it, it will be "expensive." I replaced a chandelier in my dining room with four canned lights on dimmers and it was around $500 as I recall and that was several years ago. Maybe better bulbs in the existing lighting will give you more light. https://www.houzz.com/discussions/5522977/what-lights-to-get-for-track-lighting#n=2

Im not there But it’s a walk through bathroom with vanity w one sink built in 80’s Formica it’s white Tile floor 1x1 white Walls white I’m questioning light vs dark color…. Seems 2021 look is to go light I’m looking at quartz