It only make sense to compare digital (Bitcoin) with digital (gold-backed Stablecoin)
I disagree. Both hold value which is why it makes sense comparing their values regardless of whether they are physical or digital in nature. Bitcoin will always be compared against its primary competitor which is FIAT basically.
That will help them to invest in every month, and they will see that their investment will give a big profit for a long time.
This could be a problem. You sound like you are guaranteeing profit which is not possible in this extremely volatile market. We need to help people view BTC as a currency primarily in order to improve adoption rates.