Additionally, there's a great comparison site at https://www.ec2instances.info/ to help you decide which instance-type is most cost-effective for your needs.
Simply going up an instance size might not be suitable for your need or budget.
You can see from your own monitoring that the host is capped on CPU - either use internal tools, or the AWS monitoring tab in EC2. Note EC2 doesn't show Memory usage, you'll have to get that info from your own tools.
So the site above (which is not official AWS) lets you pick a minimum CPU and Mem, and then sort on cost. Note that pricing varies across AWS DCs, and that displaying price "monthly" is easier to comprehend than per-hour pricing.
Also, instance types that start with T (that is, t3, t2, t4g instances) all use "CPU Credits" So you don't get to use the cores at 100% all day. The amount of CPU is based on a bucket that you can drink from, but slowly refills.
You can choose to turn on "Unlimited CPU" for T* instances, but this costs quite a lot, and doesn't take much before moving to a dedicated CPU instance like a M5 becomes cheaper.
For you, a t3a.medium has 4GB ram and 2 vCPUs for 4h 48m a day for $35 US/mo
Turning on Unlimited CPU could increase that to approx $80/mo at 100% usage.
A c5a.medium is the same spec, but has CPUs for 24 hours a day for $65 US/mo
If you need more CPU, a c5a.xlarge gives 8GB and 4vCPUs for $129 US/mo.
- those prices are for the Singapore DC. Others vary.
- Instance types with "a" in the third position are AMD Epyc based. That may or may not suit your need. Those with "g" are Graviton2 based which are ARM-64, and those that start with "a" are older Graviton instances. Confused? D means disk and N means faster network.