Help finding modifications

I have a 1983 Mazda B2000 that has the Ford FE 2.0L 4-cylinder. I’m the 3rd owner and it’s mechanically sound, but doesn’t produce much power (go figure) so I’m trying to find things to give it a little more power.

Only issue is it seems no matter what I look up online there’s never anything for that engine aside from replacement parts. I’m hoping someone who has a similar model can give some insight into fairly simple modifications. I’m not looking to do anything crazy, maybe just some extra horsepower.