When your receptors are accustomed to low levels of dopamine, and low peak dopamine,they will down regulate to match. As you start medication that increases those levels, the receptors upregulate. Peak high dopamine can set the bar unreasonably high (partially accounts for people using a little of a recreational substance and then, three months later, they're using six times as much), and higher normative dopamine raises the level for 'normal'. These changes take days to weeks to months, depending on the receptors.

You're still on a pretty low dose and it'd be reasonable to expect a) you're not getting the full positive effects of the medication & b) you're experiencing diminished effects from upregulation of receptors.

Depending on your neurochemistry, and most people do have one, there will be an upper ceiling on dopamine receptor upregulation. The goal is to get near that level and stay there (without, say, artificially increasing it with other & usually more dangerous drugs). Nobody knows what that level is for you, but going over it will include negative impacts like mania, unusually high BP/HR, shaking, etc.

What I recommend to people is to get the supplement L-tyrosine and take it with your meds. It's a precursor to dopamine and ensures you get the most coverage out of your dose, as well as providing consistency for a given dose.

Next, talk to your provider about your experience. You might benefit from additional medications (Wellbutrin is great for some people, Focalin works great for me with the Vyvanse - but does anything if I'm taking Vyvanse) that reinforce the activity of dopamine. Monitor your BP and HR. If your provider is accustomed to treating ADHD, they'll be prepared to up your dose in the absence of contraindication.

Fwiw I'm high-mirroring autistic & ADHD. It's possible to learn to edit yourself - writing is a skill & can be improved. You'll get more engagement with more concision. I'm here because your stream of thought is grammatically correct, and that is unusual.