I cannot give you any suggestion as I got it since playing daily since February 2021 and that is a lot of time that I roll at least 7-8 a day,it has become a habit of mine but as I say that is a very long time just to get 2 dollars.
Is this the first time you've gotten such a prize from freerolls? I wonder how many freerolls you've done in all time? You can check that by clicking on the stats tab. Personally, I've been registered on freebitcoin for a long time, but I rarely play these freerolls because of the low chance of winning big prizes. It's funny, but I just checked my stats and was surprised to find out that I've only made 1450 freerolls in all time.
I have done a lot apparently and they are 13161 rolls in total and 0.004 Bitcoin won during all the time in the site and it looks like a big amount won from the free rolls yet I have been playing 7-8 rolls for a day from early 2021,when the FUN tokens were introduced.
I kept clicking because I thought I can buy a couple of FUN every day and then it became a habit to me so I am happy by doing these clicking,I have gambled most of the amount so I never withdrew anything from here except the only time when I sold FUN and withdrew in Bitcoin.