How to determine correct Macro and Calorie amounts

No need to overcomplicate, IMO.

Start with your MFP calorie recommendation. Set activity level per instructions, considering daily life activity not including exercise. Log your exercise (carefully) and eat those calories back (or at least a big, arithmetically consistent chunk of them, like 50%-75%). Do that for 4-6 weeks, then adjust based on average weekly weight results (use a minimum of one full menstrual cycle if a premenopausal female, so you're comparing weights at the same relative point in at least two different cycles; if the first couple weeks are a roller coaster because of major eating/exercise changes causing unusual water weight shifts - which is common - throw out the weird week or two, and use 4-6 later weeks).

For macros, the MFP defaults aren't terrible for most people, so it's fine to start there. If you want to be a little more structured, this is reasonable:

https://community.myfitnesspal.com/en/discussion/819055/setting-your-calorie-and-macro-targets/p1

That also goes into other ways to estimate calorie needs, as a starting point. No matter what method you use - including a personal fitness tracker - the "test and adjust" process outlined above is a good plan. Any estimator just spits out a population average for the defined demographic values. That'll be close for most people, off (high or low) for a few, or way off (for a very rare few). Your early results tell you where you fall on the bell curve, basically.

If you want to consider recent research about protein, there's this article from an evidence-based site that is generally regarded as neutral and fairly sensible (and the article links to a protein "calculator" that can be adjusted for your details including goals):

https://examine.com/nutrition/how-much-protein-do-you-need/

The USDA's comprehensive nutrition recommendations for you can be determined via the calculator linked below. Personally, I think their recommendations are a little too focused on minimums (to avoid undernutrition) vs. optimization, and are seriously lowball for protein for active people or those losing weight, but I'm no expert.

https://www.nal.usda.gov/fnic/dri-calculator/

The general run of blogs and such have some pretty varied and sometimes really nutty advice. The above are pretty mainstream . . . which may or may not suit you.

Regardless of where you start, you may find you need to adjust somewhat based on personal experience. IMO the big issues in that are energy level and satiation. Some people need more protein or fats to feel full. Some people need moderate to high carbs to sustain energy, while others find carbs appetite-spiking. You'll learn what you need, just make moderate changes, and pay attention to results.

One note: For anyone, muscle gain is a slow, slow thing. For a woman, under ideal conditions, a quarter pound of muscle mass gain per week would be a really good result (without dangerous/illegal performance enhancing drugs). For men, twice that. Ideal conditions include a well-designed progressive strength program faithfully performed, good nutrition (especially adequate high-quality protein), sensible recovery, relative youth, good genetics, and a calorie *surplus*. Most of us don't/can't hit all of those conditions. Strength gains can be quite rapid, especially for novices at first, through neuromuscular adaptation (better recruiting and using existing muscle fibers), and improvement in appearance can also be a bit faster. So, there can be positive outcomes in less than months/years. But actual mass gain is an investment in patience and consistency. I don't know for sure, but depending on exactly what you've been doing since march (5 months or so), you may be expecting too much, quickly.

Strength training is still worth doing, for a huge number of reasons. But mass gain? So slow. 😐

Best wishes!