This isn’t normal. There is often overlap between SEO and PPC clients that strategists will sometimes manage, but the email marketing and web dev stuff should be someone else’s responsibility.

If you like your team and want to stick around, ask for a raise and outline everything like you did here. You should get a 10% raise at minimum. If they scoff at that, I would update your resume and start applying to places ASAP.

You’re being taken advantage of and it won’t stop unless you push for a different financial position. I’ve been in a similar boat and just sort of gritted my teeth hoping everything I did would be recognized and rewarded, but nothing happened. You can be making A LOT more money somewhere else if you know where and how to strategically search for opportunities.