I got a Raleigh Mountain bike in 2005 i'd say and at the time I got it just to ride around the places in the city. Now I've gotten more into going on trails, but my bike just isn't holding up like I would like it to. I don't really know exactly what model it is, but I know it was a Mojave from '05 and i payed around 280$ for it. I was looking to buy a new fork for it, but have no clue where to start. I would like something with quite a lot of travel, and im not looking to spend more than say 250$. or would you recommend me buying something(s) to make my bike better.

thanks.