By the way, which country are you from, and is the 30% interest rate real or just an assumption because it is so high? How can banks attract people to borrow money with such crazy interest rates?
Alas, this is not an assumption, here is data from the largest (local) banking website
https://www.banki.ru/products/credits/There are statistics and a loan calculator here, and in the bar above the list of bank loans (in which you can see the maximum rate of 65% per annum), the average amount of the full loan value of 32.508% is indicated. If you do not want to open the link, then here is a screenshot

I looked at the data on loan rates in Europe. With such rates of 2.65% (eurozone), I would certainly take out a loan to invest in bitcoin. I would buy bitcoin with part of the amount, and from the other part I would service the loan payments for several years until the next bitcoin price increase.