Not the Trek MT 220, that's not the frame for you,

I don't know your budget, BUT IMHO bikes older than 5 or 6 years tops tend to become harder to find parts for and are almost never worth upgrades.
Putting a set of tires~n~tubes on, truing a wheel or two, replacing even ONE cable and a chain will most likely cost more than you paid for the bike.
The cost of the used bike and the cost to, "bring it up' Is often very close to a GOOD brand's new bikes at the level you seem to need..

My Standard advice to people who are coming to or back to bikes like I did,,sounds like you are,, Is simply this,,

Don't buy from the big box stores at the mall and NEVER walmart,
Buy only from a good Local Bike Shop and NOT the Internet as you will need LOCAL bike shop support, This I promise you

Your first bike will not be your last and you will know what you need by the time you want a second bike....


Bikes are a way of life,,no, scratch that, a way to live for many of us,,these are the type of answers you will often encounter..

I've yet to see a $150 used bike that did not need another $100 plus,,
another $100-$150 gets a warranty and a SHINY new paint job !!
If you get there when they take it out of the box you may even get a whiff of that new car smell,, Remember ??