Welcome back to cycling! First, I would have your bike tuned and fitted to your body. Setting up the bike is extremely important if you want to have enjoyable ride. Also, I would install quality tires. Next, I would seek to make the bike more comfortable. Saddle technology has improved greatly and quality handlebar tape relieves hand pressure. Lastly, I would buy bicycle clothing. Bike shorts and jersys greatly improve ride quality. I would not recommend changing components. Although dated, the components should be fine. Save the money for your new bike. .