If every now and then regular people would also use this right, we’d be able to change a lot.
I was nobody - just a kid - but I was voter.
An in-person meeting is the best way. If you figure that an e-mail is worth X, then a phone call is worth perhaps 100X, and an office visit is probably 10000X. Politicians do actually want to know what people care about, and the amount of work you do to get in touch definitely factors into how representative they think your opinion may be.
Also most don't know your House Rep's office can help with way more than listening to complaints. They are very helpful. Case work, lots of student stuff (if you want to go to a military academy), maybe some grant stuff. But especially if you are having VA bureaucracy issues. There is budget for constituent services including Franking $ to reach out to their constituents. Members actually try here because it helps them win elections.