Congratulations on your winnings, well done

1) As you might have seen from the screenshots many big stakes were live bets. So from my sight it was important to choose a bookie which offers live bets regularly.
Agree 100%. Live there is much more value to be found, but it's also more time-consuming. So as (mostly) always more work/effort = more money.
2) If you are gambling regularly it is %100 advised not to keep your money on sportsbook all the time. This has nothing to do with reliability of the sportsbook. It is only for you to not be greedy and avoid unnecessary betting.
This is just a matter of discipline and money managment. But if you are struggling with that, frequent withdrawals are definitely helpful. But then again you always have to have the discipline to do these withdrawals

After that advices and advantages, i would also like to make an advice to Sportsbet.io as well from my perspective that could enhance their services even further:
1) From my sight, promotions doesnt seem attractive, i have staked more than 300 ETH in general and havent got single dime or VIP service as promotion since they only offer loss cashbacks. I know that people might say "man you have won more than a BTC, dont push your luck" but the thing is that i think VIP services and promotional offers should be on a stake amount basis, not loss amount.
Hehe, you will never be the bookies friend, if you are winning. Sportsbet, just like 99% of any other sportsbook will limit you, if you are a winning player. So even if they had a VIP programme based on turnover instead of losses, you couldn't benefit properly from it, since you wouldn't be able to generate a lot of turnover anymore with a limited account. VIP services at bookmakers are for VIP losers to keep them happy.
And besides all of that it is best that to NOT GAMBLE AT ALL, if anyone out there is just starting

The best advice

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Good luck for your future bets.