I agree with Darth. Unless you are having problems with the rear derailleur, I wouldn't change it. It looks like your bike has Shimano's bottom of the line Tourney rear derailleur. Don't let that fool. Even there low end gear performs just fine, better then some models from other brands costing much more. That's why they are so popular.
I had the Tourney rear derailleur on my comfort bike and it worked flawlessly until clumsy me stepped on it. The dealer replaced it with the sturdier Altus model, Which I'd recommend only if yours gets damaged.
Last edited by xroadcharlie; 09-14-22 at 09:48 AM.