Question Changing the Samsung system font and root security


Hello! I have a Samsung Galaxy J3 2017 phone and I want to change the font to a ttf type. I have version Android 9. I know that if you want to do as I say, you can only do it with root. The font I want to put is not found in the Galaxy store. It is an older font, used by Samsungs with Android 2 (Droid sans). In addition, can you tell me safe methods of rooting and including unrooting (I root only to change the font)? It has nothing to do with piracy or anything illegal. Thank you in advance.